To generate PDFs a separate process is launched on the server which will attempt to create the PDF based on a url relative to that of the user. If the server cannot access the url it will result in a generation error
In the case of these issues ensure that the web server can access itself using the associated DNS. For example, if users access Client Sense at
http://clientsense.domain.com/, make sure that this url resolves correctly when accessed locally from the web server