Unable to start K2 host service: Data at the root level is invalid
Just a note on one issue to pin down exact error cause. You may see the situation when K2 host service is unable to start failing on Initializing Role Provider step for provider with label “K2” with the following error: Error 2001 Error Starting Host Server: Data at the root level is invalid. Line 1, … Unable to start K2 host service: Data at the root level is invalid