@mumcuserdar The latest version should have fixed the KDE problem.
I'm not very tech-savvy either, but I found these two topics on the manjaro-forum:
- https://forum.manjaro.org/t/spectacle-libva-error-usr-lib-dri-i965-drv-video-so-init-failed/169117
- https://forum.manjaro.org/t/libva-error-usr-lib-dri-i965-drv-video-so-init-failed/159923.
It probably has something to do with your video driver. You could ask there in the forums.