Hi Mustafa
Your Workflow Customizing is not done. SWU3 transaction setup has to be done completely, especially Maintain RFC Destinations.
If you see a green check for that, it mans that the user WF-BATCH password is not in sync. Re-execute that step to re-set the password.
Here's a link for SWU3 maintenance:
Necessary configure functions  in SWU3 (wo... | SCN
Also, since it is a new system build, ensure workflow specific settings are also done (Like maintenance of data in tables, or any other settings which your individual workflows require)
Regards,
Modak