The machine has a mechanical issue.
Remove the document.
Press and hold (Power) to turn the machine off, and then turn it on again.
If the issue continues, call Brother customer service.
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If your Brother machine has 2-Sided(Duplex) Scanning feature:
The document is too long for 2-sided(duplex) scanning.
Press (Cancel). For 2-sided(duplex) scanning, use A4, Letter, Legal or Folio size paper.
Other paper must be within the following size:
Length: 147.3 to 355.6 mm (5.8 to 14.0 in)
Width: 105 to 215.9 mm (4.1 to 8.5 in)
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If your machine has FAX function:
We recommend transferring your faxes to another fax machine or to your computer before turning off the Brother machine.