What version of DLPe and excel are you using?
Looks like maybe there is some illegal chars in your CSV file.
Best to open a case with support for checking.
I've not had success in importing multiple fields in 9.3 but did find something that works for instance ID alone.
Place a single text line at the top of your list. for instance:
first real instance ID
second real instance ID
This works for me.
As for the return you have above, I agree with bphang. Clean up your fields. If you are trying a direct an import from a web-based document, your certificate is causing problems. Save locally and try again.
I had a similar problem when I did the CSV file in Microsoft Word. I work when I do in Notepad ++.
If you want to download a copy of the device from the panel of incidents, you can do the following:
1. DLP Incident Manager - go to you incident - Actions - Export Device Incident Parameters - and save file into you computer.
2. DLP Policy - Device Management - Device Definition - right click to to field Device Definition (not link but an empty part of the field) - Import from file - and choose 1 of 3 categories what you need.
Some devices even when such copying determined incorrectly, so I recommend to test all removable devices. A situation may arise when you copy from DLP Incident Manager, but it will not load correctly DLP Policy.