Error 139, Order is Locked. Help please

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I was on my 2 weeks of demo account with Interbank fx, I use the Metatrader 4 v178, built some codes, but the problem is when I try to open order or modify order, i get the Error 139, order is locked.

What is happening here? Is it because I have too many orders in a day, or is it because I try too many times to modify the order? Or is it a bug with v178?

Hope someone can enlight me.
Thanks
 
Your order is in the managers queue for processing. may be You try to modify not processed (not confirmed by manager) order. ask question your broker
in any case You need for 20-30-40 seconds timeout after each trade operation
 
I've experienced this problem before with a demo account.
altough I was able to open and close new trades without any problem,
I was never able to close that locked trade. It remained locked for several days.... :-(
Had to close the account and start a new one to get rid of it....
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