Market Registration of EA Unable to Validate

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Error
 

You are looking at the report on a mobile phone and unable to see the right-hand side of the report, which probably shows the OrderSend failing. Read the report on your PC with a normal desktop browser to see the full text (or at least flip your phone into landscape and zoom out).

Also, at the end of the report there is a link "The checks a trading robot must pass before publication in the Market". Click on it, read it and verify that your EA is following those guidelines.

 
Check your code and try again, make sure that you are not using a low max spread default setting.
 
I added screen shot of error code 
 
https://www.mql5.com/en/forum/229850
OrderSend: Error code 131 - How to handle an error on EA backtests
OrderSend: Error code 131 - How to handle an error on EA backtests
  • 2018.03.04
  • www.mql5.com
I get this error on validation my product but it is running well on backtests. I tried this and doesn't give that error anymore. Now it gives a new error code 134, i tried this: and now error 131 again. Just added that error message and passed the validation
 

For your screenshot with an Error 131 and it also has a link on "How to fix it". So follow up on it and fix your EA accordingly.

In regards to volume, you have to check the contract specification of the symbol and limit your volume to the minimum, maximum and step that is allowed for the symbol.

// Variables for symbol volume conditions
   double
      dbLotsMinimum = SymbolInfoDouble( _Symbol, SYMBOL_VOLUME_MIN  ),
      dbLotsMaximum = SymbolInfoDouble( _Symbol, SYMBOL_VOLUME_MAX  ),
      dbLotsStep    = SymbolInfoDouble( _Symbol, SYMBOL_VOLUME_STEP );
       
// Adjust volume for allowable conditions
   dbLots = fmin(  dbLotsMaximum,                           // Prevent too greater volume
            fmax(  dbLotsMinimum,                           // Prevent too smaller volume
            round( dbLots / dbLotsStep ) * dbLotsStep ) );  // Align to step value
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