ex4 or mql4 wont work by changing location

when i send my expert advisior ex4 or mql4 to another folder or another device code dont work in tester , what should i do ? any idea ?
flmo201033:
when i send my expert advisior ex4 or mql4 to another folder or another device code dont work in tester , what should i do ? any idea ?

Check the tester log for any error message.