I have tried printing an EVRi Business shipping label and am seeing following error returned:
The remote server returned an error: (401) Unauthorized
This error may be returned due to an authorisation issue with EVRi Business . In some cases the error can be resolved if you go to Linnworks.net > Shipping > Integrations > EVRi Business > Config and click on reauthorise your account.
In case it doesn't resolve the issue for you, please contact Linnworks support and we will be able to assist you further.