I created an visual webpart. Works well, but when I tried to update (Update-SPSolution...) my solution, web part does not work any more. It shows error:
Error  Web Part Menu
Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type XXX, XXX, Version=126.96.36.199, Culture=neutral, PublicKeyToken=XXX could not be found or it is not registered as safe.
Seems like even visual studio refuses to deploy this application (something like: feature XXX is allready intalled. Use force attribute to ...) Even the rectract does not help.
What's going on? How do I fix this problem? I need to be able to update this solution.