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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

when changing ex4 or mql4 location , expert wont work in tester

i programmed an expert that work correctly in tester in certain time in my laptop but when i send my ex4 or mql4 code to another pc it wont work in same time , any budy have any idea can help me