task seqeunce failed with error code 0x00000645

I have received this error when i am converting  server edition from one to other.

To resolve task sequence error 0x00000645, make sure you have entered the correct edition (/Set-Edition) with correct client product key.
For full list of client product keys, please visit technet @ https://technet.microsoft.com/en-us/library/jj612867.aspx