I GET A PLS OPEN COVER OFFLINE BUT NOTHING IS

I think the machine is telling you to look inside for a foreign object or scrap of paper:

1) Turn the machine OFF
2) Open the cover
3) Carefully inspect inside for a bit of torn paper, staple, paperclip or other such foreign object - gently clear any problem materials. Do not touch internal parts if possible. Use tweezers for small hard-to-grasp objects.
4) Close the cover, and power ON
5) If the MFC cannot reset itself, or if no foreign material is found, the machine should report an error code, for example "Machine Error XX"
6) From this code, brother support should be able to diagnose and help with your problem