Could not load file or assembly 'System.IdentityModel.Tokens.Jwt, Version=5.2.4.0

I have created a custom activity and successfully added the package in Uipath. It was executing properly in 19.7.0 version, after getting auto updated to Beta 20.2.0 version below error was throwing,

Exception:

Could not load file or assembly ‘System.IdentityModel.Tokens.Jwt, Version=5.2.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Regrads,
Tharma KS

Have you tried to open and recreate the custom activity utilizing the latest version, in your case 20.2.0?