TelerikLoaderContainer not resolving

[Chris]

I upgraded to 2.21.0 ... however when trying to add a TelerikLoaderContainer to a page it is not being recognized. Other controls are like TelerikGrid on the same page. 

Any ideas? 

[Chris]

I solved this by cleaning my nuget packages as instructed by: https://docs.microsoft.com/en-us/nuget/consume-packages/managing-the-global-packages-and-cache-folders#clearing-local-folders