I'm sorry that InDesign quits and generates an error when converting a motion path for animation.
It could be that the file is corrupt. If it's minor corruption, then you could
- Save your INDD file as an IDML file
- Open the IDML
- Save the IDML file as an INDD file
- Export with the new INDD file
If InDesign still quits with the new INDD file, try
- Creating a new document
- Moving the pages of the original document to the new document via the Pages panel
- Exporting from the new document
If InDesign is still quitting and generating an error after you try the recommendations above, would you be able to send us your InDesign file or a sample file that recreates the issue to us to troubleshoot? You can send it here:
https://ajarproductions.com/pages/contact.php