Sorry to hear about the trouble. Please try the steps shared below:
Sign out of XD and CC Desktop app.Close CoreSync and all Adobe related services from the Task Manager/Activity Monitor.Sign back in on the Adobe CC desktop app and launch XD from there.Once launched, please try opening the file.
In case if it still doesn't work, please share a few more details like:
The version of XD & OS.Is this happening with a specific file or multiple files?Is it a cloud file or a local file?...