Hi Ehsan! I am getting such failure on couple of PCs in my org. Looks like it started to appear after one of recent windows updates (about month ago). When I run command pyrevit extensions update ...
INFO: [pyrevit.loader.sessioninfo] pyRevit version: 4.4:08a3297 - with in Portland, OR INFO: [pyrevit.loader.sessioninfo] Host is Autodesk Revit 2018 (build: 20170927 ...