Unable to load Plugin Assembly

Hi All,

     I am registering plugin in plugin registration tool, it's getting below error,

"Unable to load plugin Assembly"

I used IL merge for merging Newtonsoft json dll with my plugin dll.

I have two helper classes(one is static class) to fetch data from external Api and convert it into c# classes to insert records in CRM D365.

Thanks,

Parashuram Jadhav