My question is similar to:
http://stackoverflow.com/questions/9676988/in-drupal-7-errors-for-file-managed-field-remain-even-when-fixedhttps://stackoverflow.com/questions/9676988/in-drupal-7-errors-for-file-managed-field-remain-even-when-fixed
Why error message from my custom file validator remains the same after next try where was file uploaded successfully ?
How can I solve this problem?
I didn't find any JS handler which I can extend.