Unknown column 'secure' in 'field list'

Dear Maeve!
I′ve got a problem uploading my songs.

WordPress version: 3.8.1
Plugin version: 2.4
Link to my site: https://www.avgraphx.at/woope-2

I expected the plugin to do this: add a song (3h duration)

Instead it did this: Unknown column ‘secure’ in ‘field list’

Here’s what I’ve tried so far: add the song again and again changing several Informations like title, during, … (sometimes that works *gg)

best regards from Vienna!

https://www.ads-software.com/plugins/html5-jquery-audio-player/