Hi Šárka,
Thanks to the information you gave us, we've fixed the problem on your website : In the Export options, you had set a string for the 'Append Date' option which couldn't be managed by the php date function and so, the export process couldn't finish to create the export file. We've removed the value and will let you enter a correct date format if needed.
For the second point, you're right. You can not select which custom fields you want to export. to do so, you have to create a search with the fields you want to be displayed (exported) and add an export button to your search form :
- Create a session in the Exporter based on the configuration you want
- In your search, create a 'Submit' button with 'task' set to export and 'session' set to the previously created session.
Olivier