Answer / manoj dagar

This web part has some permission level problem, it solved
with change the location of build of your web part project.

By default project build in its own bin folder but you need
to change it to site bin folder

Project Bin - %root%/ProjectName/Bin/Dll - dll after build
Site Bin - %root%\Inetpub\wwwroot\wss\VirtualDirectories\%
Site Folder%\Bin

Build the project - Copy the dll from Project Bin folder to
GAC

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