CSV Import - import settings expired

I’m on version 2.4.1, using CSV import 2.0.4, dropbox 0.7.2, and I keep getting this message

" Import settings expired. Please try again."

What can cause this? I’m not taking a long time to do the mapping, etc.

I’m having the same issue.
Omeka 2.6. I’m using Automap Column Names to Elements and the file is quite small (no files these will be added later).

Solved. Changed browser.