Event saved, but events request failed error right after that

[lsarecz]

I installed my own rg2. I managed to get it work, but when I create an event, right after it is saved into the kartat directory, it pops up this error message: Configuration error Events request failed: Internal Server Error Any idea what could I misconfigure? The request URL is: https://www.rob2020.hu/routegadget/rg2/rg2api.php?type=events&cache=false&_=1617052784875