Activation process has been terminated on (Rockstar Games)

I now very frustrated because of the problem I had for several days now and still unresolved. I always get an activation code error thus I cannot load up the program.
I know this is not a problem with my system, but it may be a problem on the developer’s end since Steam has also experienced the same concern.
Error:
Activation Failed
Activation process has been terminated.
The serial number was not found in the database. Most likely the serial number has been entered incorrectly.
Press 'Back' to retry activating (please verify the correct input of the serial number) or click 'Exit' to abort.
If the problem persists, please visit our support homepage for possible solutions:
