problem making new order

[hno2017]

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I'm adding neworder using prestashop but in the last step i got the following error that says :

Other error HTTP XML response is not parsable: array ( 0 => LibXMLError::__set_state(array( 'level' => 3, 'code' => 64, 'column' => 7, 'message' => 'XML declaration allowed only at the start of the document ', 'file' => '', 'line' => 1, )), )

Doen it has anything to do with the language?Because It's a none english website.

Thanks