Full error message: No generic method 'Sum' on type 'System.Linq.Enumerable' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic." Showing in design time, working at run time.
Hi, The fix for the issue will be available in next LIB version (2018.2.604). It will also be included in our next official version – R2 2018 SP1, scheduled for the end of June. Best regards, Ralitsa Kumanova