Epson K300 Basic Operation Manual page 44

H
Remove.
K
Connect and plug in.

I
Reattach.
L
Turn on.
J
Insert the cassette gently.
Q
If the same message appears, check the procedure for loading paper.
& 9
R
If the error continues to occur, contact Epson support.
Q
For plain paper, do not load paper
above the c arrow mark inside the
edge guide.