Where errors here

Ask the owner of the source code to give it to you or have him fix it for you.

Decompiled code is stolen code. Either you are a thief, a fence, or the receiver of stolen (intellectual) property. Either way we will not be an accomplice after the fact to theft. See also https://www.mql5.com/en/forum/134317

If you post decompiled code again, you will likely be banned.

Don't tell us you found it on the 'net: if someone stole your bank details and uploaded them on to the internet, is it OK for everyone to use them because "someone uploaded it, I don't know why I can't use that"?