This morning on Platform Version 2.3.5.103 Hubitat Package Manager flagged available updates as is often the case. In checking for updates, it found an update for webCoRE 1.0.75
I have logged out of the hub and back in and tried HPM again and the error is the same. Since HPM worked prior to 2.3.103, it may be that the error is specific to this update.
@thebearmay I had forgotten that HPM has a password configuration. I remember now that I changed my Hub password two weeks ago. I hate when that happens. Thanks for the heads up!