Once again, first thing in a GOOGLE search!
Brady TLS2200 manual
https://www.cableorganizer.com/images/brady/tls2200/manual.pdf
Page 77 error messages
Error in Checksum
The software was improperly installed on your printer. (or lost or corrupted in the memory.)
Contact Brady Technical support group.
You likely need to use Brady's software to create the label on the PC, and your PC will need the correct printer drivers to communicate with the Brady. The software and drivers should be available from Brady.