Getting "Method not found" Exception

I am getting following exception while exporting Pdf page to Image on Visual Studio 2019

Method not found: 'System.String Jose.JWT.Encode(System.Object, System.Object, Jose.JwsAlgorithm, System.Collections.Generic.IDictionary`2<System.String,System.Object>, Jose.JwtSettings)'

Line of Code is:

 FileRef result = createPdfOperation.Execute(executionContext);