Object reference not set to an instance of an object – error in Dynamics 365 Plugin Registration Tool

Hi Everyone,

Today I was working on some plugin work  and was On-Premise system and when I try click on Register new assembly via Plugin Registration Tool, I was getting "Object reference not set to an instance of an object" error.

If it was my machine, I could have downloaded XRMToolBox or latest Plugin Registration tool but I was working on the server and don't have any permissions to download the required. I was completely stuck with it and don't even know what to do. 

After quick search, came to know that clearing contents in Appdata would solve the issue.

Navigated to "C:\Users\<UserName>\AppData\Roaming\Microsoft\PluginRegistration" and deleted all the contents and then Plugin Registration started working normally.

Hope this helps.

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Happy 365'ing
Gopinath.