Javascript Error Fix
When you see this error in WDF POS when trying to use the receipt printer, label printer, or scale:

There are two main causes.
The first thing to check for would be that Apps on device is enabled:
THIS STEP IS VERY IMPORTANT TO RESOLVING THE ISSUE
If this setting is already enabled, you may need to reinstall JSPrintManager. Here is the guide to how you can accomplish this:
https://support.washdryfoldpos.com/article/274-reinstalling-js-print-manager
If you still need assistance, please feel free to submit a support ticket and a technical support member will reach out to you! Here is how you can submit a support ticket:
https://support.washdryfoldpos.com/article/268-submitting-a-support-ticket