Error tracing: JMP tries to "help"
JMP helps the user to "trace" errors in JSL code: It doesn't indicate the line of code where the error "happens".
It tries to find out where the actual error is in the code and shows this line.In the below example, the error message just shows up if line 6 is uncommented --> error "happens" in line 6.
But the erroneous code (Graph Bulder without "i") is in line 4.And JMP, indeed mentions line 4 -> ...