Hello there,
i’m having the same issue. Regardless of how easy the math expression is, the error is about “casting” failed, like it were trying to cast the mathe expression in some way.
Error-Header:
Unknown exception - code 00000001 (first/second chance not available)
Cast of K2Node_MacroInstance //Game//Blueprints//BP_2D_Array_Int.BP_2D_Array_Int:GetElementAt.K2Node_MacroInstance_438 to K2Node_MathExpression failed
If I replace the expressions by the graph they represent it works fine without error. The error crash at startup appears if the blueprint was saved before compiling, so each time the blueprint is opened again, the editor crashes immediatly.
I’m using version 4.4.2.