I have this expression and haven't been able to eliminate the divide by zero error. I also tried creating custom code but the examples I've seen as far as where to put the code.divideby don't seem to work with this expression.

The issue is with the part that is bolded

Can anyone help with this?

=((Sum(Fields!field3.Value) / Sum(Fields!field1.Value) * 10 + Sum(Fields!field4.Value) / Sum(Fields!field1.Value) * 10 + Sum(Fields!field5.Value) / Sum(Fields!field1.Value) * 10 + Sum(Fields!field6.Value) / Sum(Fields!field1.Value) * 10) - (Sum(Fields!field7.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field8.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field9.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field10.Value) / Sum(Fields!field2.Value) * 10)) / (Sum(Fields!field7.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field8.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field9.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field10.Value) / Sum(Fields!field2.Value) * 10)