I keep getting error message 5100\r\nhow can I fix

This error means that there is something obstructing the printing process. Check inside your printer through the gears that you can see under the lid. There should be something obstructing the gears such as dirt or other small debris. Check VERY thoroughly with a flashlight.

Get "canned air" at any computer or office supply store and blow the inside of the printer out as much as possible. Invariably, the debris will loosen up and come out.