Intellisense error everytime i try to code

Good Day, I am running NAV 2016 CU 11 on a server and every time i try to write code in the development environment my application crashes and gives me the error below. I can confirm that the dll has been installed [C:\Program Files (x86)\Microsoft Dynamics NAV\90\RoleTailored Client\Add-ins\CodeViewer\CommonComponents] and is not marked as read only.....

Has anyone seen this before and know how to get around it?

Error: Could not load type 'Microsoft.VisualStudio.Language.Intellisense.Completion2'
from assembly 'Microsoft.VisualStudio.Language.Intellisense, Version=12.0.0.0,