With loglevel set to debug I see the following error:
DEBUG: Failure loading assembly: C:\src\test\scriptcs_packages\ScriptCs.Gist.0.1.2\lib\net45\ScriptCs.Gist.dll. Exception: Method 'get_Description' in type 'ScriptCs.Gist.GistReplCommand' from assembly 'ScriptCs.Gist, Version=0.1.2.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.
With loglevel set to debug I see the following error: