Please check the following:

The most common reason is that your labels are loaded upside down. Please make sure that your labels are properly loaded. The label that you peel off should be facing the ceiling when it comes out of iDPRT. See the image below:

1. Ensure your labels are "Direct Thermal" labels.

  2.Press and hold the top circular button until you hear two beeps. iDPRT will print a test page. If the test print looks good, try to print the attached label.