This article explains how to handle error code 1155 when uploading a PDF or another file in the virtual classroom Presentation Library
Symptoms of the problem
On Windows computers when uploading a PDF or other document file you may get the following message:
An error occurred while trying to process the file. It is either not present or there is no application associated with this file.
The error code returned was: 1155
Causes / Reasons
This happens when Electa Live cannot find the application that handles files of that type or the file type is not supported.
Reinstall the application which which you normally open your file. If this is a PDF file reinstall Acrobat Reader.