GPG key making backup error

hi, when I try to make a backup for the GPG key I do all the steps till I reach saving the file .asc it gives me this message ______________________________ <big><b>Couldn't export key.</b></big> General error ______________________________ what's the solution ? thank you Ahmad Alhosiny note: I've send this message before but I had a mistake that I wrote "GPG key exporting error" _________________________________________________________________ Drag n’ drop—Get easy photo sharing with Windows Live™ Photos. http://www.microsoft.com/windows/windowslive/products/photos.aspx