An error occurred while executing a save: Expression evaluation error : Attempted to run a second smart service, but only one smart service can be run per expression evaluation

Hi,

Am getting this error:" : An error occurred while executing a save: Expression evaluation error : Attempted to run a second smart service, but only one smart service can be run per expression evaluation". 

Can someone help out how to sort  this out.

I have read other documentation it was asked to use another smart service in Process Model, but in my case there is only one process Model and the interface has been called in Start process ...so basically how to use. I hve attached the code. Thanks

saveInto: {
                rule!Abc(
                  cdt_Abc: local!cdt_Xyz
                ),
                a!save(local!viewButtonAction, "VIEW"),
                a!startProcess(
                  
                  processModel: cons!APPIAN_PROCESS_MODEL_MAIL,
                  processParameters: {
                    Notes: ri!Notes,
                    sendTo: local!sendTo,
                    
                    
                  },
                  onSuccess:                        
                  {
                    a!save(
                      ri!MovesInfo,
                      fv!processInfo
                    )
                  }
                )
              }