Compile Errors and What They Mean

A wrong answer on the download page is designed to stop the compile, so an unprotected EA can never be built by mistake. Find your error below.

Errors and fixes

MetaEditor says	Cause	Fix
`'start' - function already defined`	Your EA is old-style but Old-style code was not ticked.	Download again with Old-style code ticked.
`'OnTick' - function already defined`	You answered “no OnTick” but your EA has one.	Answer Yes to the OnTick question.
`'OnInit' - function already defined`	You answered “No OnInit()” but your EA has one.	Correct the OnInit answer.
`'OnTimer' - function already defined`	You answered “No OnTick() and no OnTimer()” but your EA has an OnTimer.	Answer “No, it runs on OnTimer()”.
`identifier already used` near `init` or `start`	Old-style mode renames those words, including a variable of that name.	Rename the variable, or use Manual mode.
An error where your code calls `OnTimer();` or `OnChartEvent(...)` itself	The file guards those handlers; calling them directly cannot compile.	Move that logic into its own function and call that, or use Manual mode.
`cannot open include file`	The .mqh is not in `Include/FXNook/`.	Extract the ZIP into the Include folder.
`FXNook: this licence file is included more than once`	Two include lines.	Keep one, at the top.
`void function returns a value` or `function must have a body`	The OnInit answer does not match (void vs int), or a function you said exists does not.	Download again with the correct answers.

Warnings from your own code (for example “deprecated”) are unrelated to licensing. The licensing file itself compiles with no warnings.