Problem
I have tried printing a GFS shipping label and am seeing an error returned:
Validation Error: 420505: The destination location is invalid. Please check the data. 420000: Data error 220001: Failure
Solution
The error means that either the town or country are misspelled. You can check the right spelling that is accepted by DHL here: http://dct.dhl.com/
Once checked, please amend the spelling in Orders > Open Orders > find the needed Order > click on the Order ID and Edit the address.
If any issues or questions, feel free to contact Linnworks Technical Support!