You cannot inherit the properties and methods of the DocuSign SmartObject dll assembly in a Visual Studio custom project. An error is thrown.
error CS0509: 'ExtendDoc': cannot derive from sealed type 'Broker'
The assembly was marked as sealed, therefore inheritance was not allowed.
- Ensure you have K2 4.7 installed.
- Download and Install the K2 4.7 March 2018 Cumulative Update from K2 Partner and Customer Portal.
- Get the K2 4.7 March 2018 Cumulative Update FP6 from Regional Support.
- Install the K2 4.7 March 2018 Cumulative Update FP6 to apply the fix.