We are sorry to hear you are facing trouble while exporting Ai files into XD. Would you mind telling us if it's happening with every file or with a specific file? What is the OS and XD version of your machine?
We will try our best to help.
Sorry to hear about the trouble. While importing AI file in XD there are certain non-supported feature which are listed here: https://helpx.adobe.com/xd/kb/open-illustrator-files-in-xd.html
I'd recommend importing it as SVG or you can try the suggestions shared here: https://helpx.adobe.com/xd/help/working-with-external-assets.html#illustrator
Let us know if this helps or if you need any further assistance.