Error: E-Mail Message required! Opencart admin

You recieve the error - "email message required" when trying to send a newsletter or send a email to your store members / customers / affiliates ? There is a problem in the 1.5.5.1 Opencart version which can easily be solved.

You can try this:
1. Open file "contact.tpl" in the "admin\view\template\sale" folder of your opencart store
2. Go to line 244, you'll see the line:

CODE: 

$('textarea[name=\'message\']').html($('textarea[name=\'message\']').val());


and replace with:

CODE: 

$('textarea[name=\'message\']').html(CKEDITOR.instances.message.getData());


3. Save the file and test. Now it should say "Your message has been successfully sent!"