This error causes Worldship to be unable to communicate back to UPS:

Steps to resolve:

1. Close Worldship

2. Navigate to C:\Programdata\UPS\WSTD\PSD

3. Clear out any files that are 0kb in size

4. Re-launch Worldship

At this point Worldship should open without the communication failure. If still getting the error here is a secondary method provided by UPS support:

1. Close Worldship

2. Navigate to C:\Programdata\UPS\WSTD\Outmail

3. Clear contents of the Outmail folder completely

4. Re-launch Worldship