May i know what is the version of the Lightroom you are using, also are you using a Mac or Windows computer.
Also please provide the detail about the error message.
Lightroom CC and a Mac - have imported a lot before without any problems. No recent updates or otherwise changed conditions.
Very happy for a clue. Thanks
I have found the problem myself. The Image title contained a / sign - with that removed it works fine. Thanks for your time.
Anything else i can help you with