Integrating GC420t printer to my application

I developed an application where I need to print the data through the zebra GC420t printer. I connected the printer using USB to my PC and Installed all the softwares required for the printer and I can print the test through the printer. Previously I installed the software and my application to other laptop it was working fine. When I open my application in previous PC it was showing a permission alert but now in different PC nothing is shown and cannot be printed.

please help me in resolving this