VS 2017 IDE can't start: Method not found after installing Microsoft.VisualStudio.Shell.15.0 package with gacutil.exe

I had an error when starting the WebCompiler extension, that Microsoft.VisualStudio.Shell.15.0.dll was missing.

After some searches, I found that I can install it via the PackageManager console in VS 2017.I found and installed a version compatible with .Net 4.5, but still had the same error.

A thread suggested that I should use the gacutil.exe to copy the dll to the cache.So I run this command:

PS C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6.1 Tools> .\gacutil.exe -i 'D:\MyProjectFolder\packages\Microsoft.VisualStudio.Shell.15.0.15.0.26201\lib\Microsoft.VisualStudio.Shell.15.0.dll'

After this, my VS 2017 IDE triggers the below error when I try to start it:

I tried repairing it, re-install it, restarting my computer, delete the dll from c:\windows\assemblies, but without luck.

Anyone knows how I can fix this?