TS19 Unknown Asset Error

I ran into this error while downloading some assets for a route. Any idea what the problem is and how to fix it?

"Unable to open CDP file 'I:/Trainz Railroad Simulator 2019/data/cache/internet/jy7kQoed17.cdp' for reading"

This means that the download its self is corrupted. Try downloading that asset again that you attempted when you got that error. If your antivirus program scans your Trainz content folders, this error can occur so I recommend excluding your Trainz data folder and the Trainz program its self from real-time scanning.

Another issue that can cause this is a physical driver error, meaning the drive its self is having issues. The best thing you can do is scan your I: drive for errors and if the drive scan shows problems, back up the data immediately and replace the hard drive if reformatting doesn't solve the issue.