I have a .NET application that converts dozens of RTF files to PDF on a nightly basis. Occasionally, maybe once a week, I get the following error message with a few of the files:
Value cannot be null.
Parameter name: entity
What I've found with all of the files that have this error is that the RTF file has an embedded image of some sort. These are patient medical files so I'm unable to provide you with a copy, unfortunately. If I manually convert the RTF files to PDF using Adobe Acrobat Standard, I have no problem. Please advise on how to resolve this issue.