barcode not read by scanner

hi all.

i have create programe for printing barcode.programme running fine and i can print barcode on laser printer.but when i try to scan from barcode reader.its not reading by scanner.

whats problem with it????

i used following tutorial .

https://www.sdn.sap.com/irj/scn/wiki?path=/display/profile/newBarcodePrintinginSAPusingSmartforms