You have to allow DLL in the terminal's options (CTRL-O) tab: Expert Advisor

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All,
I have write a EA for test, it imports some functions from another DLL, but I could not do the back test, it always said 'the DLL is not allowed', e.g.
"2016.10.15 10:28:09.389 2016.09.01 00:00 Cannot call 'ConsoleApplication2.dll::InitPipe', DLL is not allowed.'
But, how can I allow the DLL importing for the back test?