Question Enigma ERROR: Unexpected exception: File is already Protected

[Kingstv]

Hello guys,
Actually i have tried to protect my application using enigma, after i tried to protect the application,
it shows an Error like this :

ERROR: Unexpected exception: File is a already protected {compressed}, protection stopped
The problem is i have never tried to protect this file before even when i run the original file there is nothing to show that the file is protected !
is there anyone cane help me out of this problem !? !? !
Is there any way to do something other way around with a file that has been protected with Enigma !?
Thanks in advance