YAST doen't open after i load a repository on version 12.3

Hello,

i have distractly load a all repository on my machine from a party i was looking for a file and now when i try to open

yast it say me

terminate called after throwing an instance of 'YUIPluginException'
what(): Couldn't load plug-in qt
YaST got signal 6 at YCP file Wizard.ycp:720
/sbin/yast2: line 431: 4026 Annullato $ybindir/y2base $module "$@" "$SELECTED_GUI" $Y2_GEOMETRY $Y2UI_ARGS

4026 annullato means 4026 off
I could not understand which plugin it is so that i can try to remove with apper or downgrade.

When i try to open thunderbird also it crash at start up. But some functionality works fine like libre office and firefox.

Is there a way to set back all the modify and will it be convinient?

Thanks

GM