avfilter "Equalizer" error messages

When add "Equalizer", recive error message:

Equalizer [filter avfilter.equalizer ] Cannot init filter

"Superequalizer" throw error too:

Superequalizer [filter avfilter.superequalizer ] Unexpected return format

SOFTWARE/OS VERSIONS Ubuntu Studio 19.10 x64 Kdenlive from appimage 20.04.1 KDE Frameworks 5.68.0 Qt 5.14.1 (built against 5.14.1) The xcb windowing system