This error message occurs when there has been an error saving the pdf file in the data base.
You can solve it by creating a new label.
Normally this error comes when the database provider is automatically updating the database used for storing your labels. The updates are normally completed with 10-15 min.
This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Message>Service is unavailable at this time.</Message>