This is a bit of a blast from the past type of post, but I would write about this anyway.
In 4.6.11 you may observe the following error logged on K2 service startup:
“Error”,”System”,”2010″,”TypeLoadError”,”SourceCode.Hosting.Server.Runtime.HostTypeLoader.LoadHostableTypes”,”2010 Type Load Error, Method ‘get_DisplayName’ in type ‘SourceCode.Hosting.Runtime.Group’ from assembly ‘SourceCode.Hosting.Runtime.IdentityService, Version=188.8.131.52, Culture=neutral, PublicKeyToken=16a2c5aaaa1b130d’ does not have an implementation.”
This error gets logged on K2 service startup and only in case you have certain rollups/coldfixes in place – it does not appear if you use 4.6.11 RTM.
This error can be caused by by the presence of SourceCode.Hosting.Runtime.IdentityService.dll in “C:\Program Files (x86)\K2 blackpearl\Host Server\Bin\HostedServers” – whereas this file is only supposed to be located in “C:\Program Files (x86)\K2 blackpearl\Host Server\Bin\HostedServices”. It’s a very good example of pitfalls related with use legacy K2 patching model involving manual files replacement – error prone and slow process. Luckily starting from 4.7 there are CU and FP with which installers almost fully addressed such type of problems.