Error Starting Management Shell – Method ‘Upgrade’ in type
On opening the SharePoint 2013 Management Shell, an error occurs even though using a Shell Administrator with proper permissions in the database:
Method ‘Upgrade’ in type ‘Microsoft.SharePoint.WorkflowServices.WorkflowServiceApplicationProxy’ from assembly ‘Microsoft.SharePoint.WorkflowService, Version=126.96.36.199.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c’ does not have implementation.
This looks something like this:
This error is generated by a missing update, specifically KB2880963. Two methods to fix this is to run Windows Update (making sure you are getting all product updates) or simply download the hotfix from Microsoft:
I suggest simply doing the download - repeated runs of Windows Update still didn't pick it up every time.