Please attach the csv file.
I will look into it then.

Thanks markusfluer! :)

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=19901

There was a small bug on our side, because an error visualisation methdod was not loaded correctly.
Still the bug did only appear when the csv-file was incorrect.
Please look into the csv file, that it is correctly parsed.
The CSV-File that you uploaded was errenous.
You do not need to quote the values in a csv file, the data separation comes from the comma, and if you quote, please see that you do not double, or triple quote.

Thank you very much for your bug report i hope we could help you.

Thank you Markusfleur! That was quick.
I've replaced the two lines with the lines mentioned by you. Upload now works smoothly. However, limesurvey is reporting that there has been an error and no data was uploaded. In particular it says:

Could not create token table
3 records in csv-file
3 records fulfill the minimum requirements
0 records have been uploaded

Warning

3 records with other invalid information

Line 1 : Array ( )
Line 2 : Array ( )
Line 3 : Array ( )

The csv file I'm uploading looks like this:

firstname,lastname,email
Max,Mustermann,mustermann@web.de
Fritz,Hansmann,fritz-hansmann@gmail.com
Wurst,Hans,hans-wurst@web.de

Any suggestions? Actually it's not a big issue because all records have succesfully been uploaded but I think for some users this error message might be irritating.

Thank you!

Hello,
this issue looks solved but the last message of Heinrich points out another bug, which I was able to replicate.
I have been able to upload my panel, nevertheless the upload reports a full failure.
BTW I just upgraded to 2.5 and it is much better than any previous version :-)

Version 2.50 Build 160804 released