Error: the encrypted value for the "logoncred" configuration setting cannot be decrypted

I got an error:

”the encrypted value for the "logoncred" configuration setting cannot be decrypted”

open cmd as Administrator
Navigate to: C:\Program Files\Microsoft SQL Server\90\Tools\Binn
RSKeyMgmt.exe should be in that directory.
type: rskeymgmt –d and it overrides the Reporting Services Management Console