need help errow 2b4

I have a 2 head tajima, and when i put floppy in to load memory i get error code 2b4 ****ch says funtion code error stitch code is not punched at the third character. I reloaded system still reading error. please help,thanks Jerry Smith

try with another design
try with an new disk
try to format the disk-tajima
are you sure is a good disk?(720k or 1.44k)

do you use the machine floppy or an external reader?
if you use an external reader:

turn off the machine
wait 5 minutes
disconnect and connect 2or3 times cable connectors from the machine side and reader side.
try to load design again.