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Help on EA error fixing

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I just downloaded the code from this very nice article:

Code can be downloaded here: 

Unfortunately when I run it on the simulator I get the following errors: 

 2011.11.13 23:39:58 2011.11.01 14:20:00   Alert: The Sell order request could not be completed -error:4756
 2011.11.13 23:39:58 2011.11.01 14:20:00   failed instant sell 1.00 EURUSD at 1.36833 sl: 1.37133 tp: 1.35833 [Invalid request]


No trades are executed.

Could someone help fixing?

I posted into article discussion but no one answered. 



Step-By-Step Guide to writing an Expert Advisor in MQL5 for Beginners
  • 2010.06.09
  • Samuel
The Expert Advisors programming in MQL5 is simple, and you can learn it easy. In this step by step guide, you will see the basic steps required in writing a simple Expert Advisor based on a developed trading strategy. The structure of an Expert Advisor, the use of built-in technical indicators and trading functions, the details of the Debug mode and use of the Strategy Tester are presented.
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