Brother MFC-J2510 Basic User's Manual page 112

Error Message
Wrong Paper
104
Cause
The paper size setting does not
match the size of paper in the tray.
The paper orientation is not correct
for the paper size.
You did not set the paper guides in
the tray to the indicators for the paper
size you are using.
Action
1 Check that the paper size you
choose matches the size of paper
in the tray.
(See Paper Size on page 33.)
2 Make sure you loaded the paper
in the correct orientation, by
setting the paper guides at the
indicators for your paper size.
(See Loading paper and other
print media on page 21.)
3 After you have checked the paper
size and the paper orientation,
press OK on the Touchscreen.