Upon updating to 2.3.4.120, all my cloud and local webCoRE URLs failed. Trying the URLs in the browser directly, I got this error:

Reverting to 2.3.4.119 resolved the issue.
Upon updating to 2.3.4.120, all my cloud and local webCoRE URLs failed. Trying the URLs in the browser directly, I got this error:

Reverting to 2.3.4.119 resolved the issue.
was there anything in the HE logs related to this?
Can you PM me your hub's id? I can check the engineering logs.
Sent
It's getting stack overflow errors, see below. The excessive hub load errors come from app getting it too many times.
java.lang.StackOverflowError
at user_app_ady624_webCoRE_Piston_138.wappUpdateLabel(user_app_ady624_webCoRE_Piston_138.groovy:12842)
at user_app_ady624_webCoRE_Piston_138.checkLabel(user_app_ady624_webCoRE_Piston_138.groovy:1461)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:2075)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
at user_app_ady624_webCoRE_137.registerInstance(user_app_ady624_webCoRE_137.groovy:3390)
at user_app_ady624_webCoRE_137.updateEndpoint(user_app_ady624_webCoRE_137.groovy:1190)
at user_app_ady624_webCoRE_137.gtPdata(user_app_ady624_webCoRE_137.groovy:940)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_Piston_138.wgtPdata(user_app_ady624_webCoRE_Piston_138.groovy:12775)
at user_app_ady624_webCoRE_Piston_138.getParentCache(user_app_ady624_webCoRE_Piston_138.groovy:2119)
at user_app_ady624_webCoRE_Piston_138.getDSCache(user_app_ady624_webCoRE_Piston_138.groovy:1946)
at user_app_ady624_webCoRE_Piston_138.getCachedMaps(user_app_ady624_webCoRE_Piston_138.groovy:1921)
at user_app_ady624_webCoRE_Piston_138.curPState(user_app_ady624_webCoRE_Piston_138.groovy:1044)
at com.hubitat.handler.AppHandler.runAppMethodWithException(AppHandler.groovy:113)
at com.hubitat.handler.AppHandler.runAppMethod(AppHandler.groovy:55)
at com.hubitat.app.InstalledAppWrapper.methodMissing(InstalledAppWrapper.groovy:194)
at user_app_ady624_webCoRE_137.gtMeta(user_app_ady624_webCoRE_137.groovy:3618)
at user_app_ady624_webCoRE_137$_registerInstance_closure110.doCall(user_app_ady624_webCoRE_137.groovy:3392)
English? Whose error is that? Mine, Hubitat's, webCoRE?
Not good, dev will need to dig into code and figure out what is causing..
Knowing @nh.schottfam though it will see a resolution relatively quickly...
I'm sure. Meanwhile, I can stick with 2.3.4.119 ... no errors like that in the logs now. Just thought I should report.
thx for the report. Trying to understand what is going on with Victor.
So I have updated my hub to .120 and things seem to work fine.
Can I ask you ensure webcore is up to date, and try again?
FYI, my hub I updated is a C5 with latest webcore (did not change it today, so from earlier)
Will do when I have more time. Are you thinking this might have been a glitch in the update, or was there something in the latest webCoRE update to consider? I did consider rerunning the update this morning, but sometimes the more I try to fix things, the more they break. 
It may be an glitch during update.
Well, updating to .120 a second time appears to have worked, so we'll have to go with glitch. Strange how everything else, including the pistons, worked, though. The only problem I found at the time was executing a piston via URL, and that seemed like a pretty specific error to me.
But, no matter, if it's working I'll move on. Thanks.
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