In uDirect / uCreate Print, the rules or logic are stored internally in the document. When you export to a CPKG or Save to the XMPie server, the rules are pulled out of the document into a separate plan file. Also, if you import a CPKG into uCreate print correctly, then even if there is a separate plan file, it should work fine. (This could be version dependent and I can't remember exactly if it will work in v7.5.)
Anyhow, regarding your specific problem - crashes during export - this is normally due to a problem like:
* bad font (either corrupted, or incorrectly installed in that it cannot be exported into the package)
* bad asset (possibly an asset which is inaccessible when trying to zip it into the package - I have even seen an asset saved with the wrong file extension cause this problem.)
* some element in the InDesign file that is corrupted in some way (nested tables are a common cause of problems.)
The best way forward for you is to identify if the problem is with your uCreate Print / InDesign installations, or in this specific file.
I would suggest to create a new clean InDesign document, link it to a datasource. Put a content object on the page using a fairly standard system font, save the document and try to export.
1) If it works, the problem is most likely in the document and the way forward is to start removing things until you find the item that is causing the crash. EG, remove some pages, save and retest the export. if it still crashes, try to remove more items until you get a successful export, then add items back in progressively until you identify the offending object.
2) if a clean document does not export successfully, then try uninstall uCreate Print and InDesign, and reinstall. (you could also try clearing the Adobe InDesign cache first before the reinstallation if you like - you will find information about that in google search)
If you continue to have problems, or need more urgent help, you should log a support case with your XMPie or Xerox channel support team.