This error is caused by having the Demo only! Use open azure storage links for images and attachments option enabled in  Lasernet > Setup > Parameters.

This issue occurs because the demo mode will try to use an Azure connection to communicate with Lasernet by providing the Account key and Azure Account Name in the JobInfos section of the XML. However, On-prem solutions do not use Azure-type connections. 

Solution

To resolve this error, navigate to Lasernet > Setup > Parameters and disable the Demo only! Use open azure storage links for images and attachments option.