There is an error returned when trying to print a Royal Mail label:
Error: Cannot generate labels. You haven't submitted Royal Mail OBA manifest in the last 24 hours. Royal Mail requires manifest to be submitted daily. Go to Royal Mail manifest and file it.
To avoid this error please make sure to file the manifest at the end of each day after you printed Royal Mail labels. The easiest way to resolve the error would be to file the manifest with your current consignments via Linnworks.net > Shipping > Shipping Manifests > File > File.
If there is still a problem please contact Linnworks support to resolve the issue.