Could not load file or assembly 'Telerik.Web.UI' or one of its dependencies

Question

I have telrik Q3 ( latest version) and after the abnormal shutdown i am continuously facing that error.

Could not load file or assembly 'Telerik.Web.UI' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) 

I also reinstall the telerik but problem is not resolved. Any one please help me.

Answer 1

The temp files that is created by IIS or the built-in Visual Studio development server might cause such problems. Close Visual Studio and try finding your project in one of these places and delete the folder:

C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files

(Adjust according to the framework you use for the project)

As suggested by Chris Herring, also try deleting files inside this folder:

C:\Users\%USERNAME%\AppData\Local\Temp\Temporary ASP.NET Files

You might also want to remove the website cache:

C:\Users\%USERNAME%\AppData\Local\Microsoft\WebSiteCache

If that still does not solve the problem, deleting all temp files as suggested by Arun CM could be a final option:

%TEMP%

You can open these folders quickly by clicking the Start menu, pasting it in the search field (Win7, Vista) or through the Run option (XP), and hitting enter.