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It's NOT the code, To execute the code you need the 'History'' which is not build correctly. I have the same error with experts which did run on this machine - and still do run on another machine - using the SAME broker and account. It MUST BE anything with Metatrader or the tester.
If you read the answer of the OP, you will see it WAS a code issue, trying to access an inexistant timeframe data. And it happened randomly due to an uninitialized variable.
Sorry, but your 2 posts are useless as they don't provide any technical details about the issue. Check your code.