You can check these common error sources responsible for brother printer in error state
Check the Printer Connection: Make sure the computer’s power and USB connections are connected. Check to see whether they are correctly connected to the sockets and if the problem is with the power cables.
Restart the Brother Printer and Computer: Shut down the Brother Printer and Computer for a few minutes and then restart both of them.
Check Blockages in the paper flow: Look inside the printer tray to see if there is any stuck paper.
If you’ve tried all of the troubleshooting procedures and your Brother Printer is still not working.