Call issue return in epicor function

Hello,
i called IssueReturn in the epicor funciton. I already include the Assembly Erp.Bo.Contracts.IssueReturn. but I got the following error.
please help.

thanks,

Eddy

Sorry, i fogot add the error

Hello,
now, I got the following error
the problem is i can not see any method in the Erp.Tablesets.SelectedJobAsmblTableset(). is there any way we can see it. thanks,

Eddy