When you execute a REST Endpoint SmartObject method that has nullable return types, temporary assemblies are created in the K2 Host Server Bin folder to assist in identifying the type. They remain after the method has completed.
The created temporary assemblies were not being deleted after use.
- Ensure you have K2 Five RTM installed.
- Get the K2 Five RTM FP25 from Regional Support.
- Install the K2 Five RTM FP25 to apply the fix.