Plasma-shell is not initialising after killing plasmashell using command kquitapp5 plasmashell

Actually, System Setting was not working/opening, so I thought to restart plasmashell, but when i tried to restart start plasmashell using command kstart5 plasmashell , it starting to give errors

Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Failed to register unity service
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
trying to show an empty dialog
trying to show an empty dialog
libkcups: CUPS-Get-Printers last error: 1030 No destinations added.
libkcups: Create-Printer-Subscriptions last error: 0 successful-ok
libkcups: Get-Jobs last error: 0 successful-ok
libkcups: Get-Jobs last error: 0 successful-ok
QQuickItem::stackAfter: Cannot stack StatusNotifierItem_QMLTYPE_430(0x563953a63190, parent=0x5639537392e0, geometry=0,0 0x0) after StatusNotifierItem_QMLTYPE_430(0x563953a577e0), which must be a sibling
QQuickItem::stackAfter: Cannot stack StatusNotifierItem_QMLTYPE_430(0x563953a55400, parent=0x5639537392e0, geometry=0,0 0x0) after StatusNotifierItem_QMLTYPE_430(0x563953a63190), which must be a sibling
QQuickItem::stackAfter: Cannot stack StatusNotifierItem_QMLTYPE_430(0x563953a77f00, parent=0x5639537392e0, geometry=0,0 0x0) after StatusNotifierItem_QMLTYPE_430(0x563953a55400), which must be a sibling
QQuickItem::stackAfter: Cannot stack StatusNotifierItem_QMLTYPE_430(0x563953a7a0a0, parent=0x5639537392e0, geometry=0,0 0x0) after StatusNotifierItem_QMLTYPE_430(0x563953a77f00), which must be a sibling
Plasma Shell startup completed
libkcups: 0
libkcups: 0
Both point size and pixel size set. Using pixel size.
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
KAStatsFavoritesModel::setFavorites is ignored
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
Entry is not valid "kontact.desktop" QSharedPointer(0x563953e200b0)
Entry is not valid "ktp-contactlist.desktop" QSharedPointer(0x563953e200b0)
Entry is not valid "kontact.desktop" QSharedPointer(0x563953e200b0)
Entry is not valid "ktp-contactlist.desktop" QSharedPointer(0x563953e200b0)
trying to show an empty dialog
[abhi@ABHI ~]$ file:///home/abhi/.local/share/plasma/plasmoids/org.kde.simpleMonitor/contents/ui/main.qml:114: Error: Cannot assign [undefined] to QString
qt.svg: <input>:120: Could not resolve property: #a
Icon theme "Numix-Circle-Light" not found.
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/8x8/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/16x16/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/16x16/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/22x22/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/24x24/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/24x24/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/32x32/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/32x32/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/48x48/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/48x48/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/64x64/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/64x64/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/96x96/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/96x96/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/256x256/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/512x512/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/scalable/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/scalable/ui/"
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
file:///usr/lib/qt/qml/org/kde/plasma/components.3/ComboBox.qml:150:13: Unable to assign [undefined] to QQmlComponent*
file:///usr/lib/qt/qml/org/kde/plasma/components.3/ComboBox.qml:150:13: Unable to assign [undefined] to QQmlComponent*

Approximately all the applications seems to work fine when start from command line. But the panels, dock, etc everything is removed

I'm only on a cell (can't read), whenever possible post terminal output as text not a picture. Please edit your post and post the outputs correctly:

Have you instead tried the command:

plasmashell &

Or:

killall plasmashell; kstart plasmashell

I tried it, but same error occurred.
Actually, during executing this command, for some instance panel showed up and then disappeared

You just did an update and didn't reboot?

I rebooted the system

Since system setting was not working i executed tha command pacman-mirrors -f5 && sudo pacman -Syyu which was mentioned as a solution for this in manjaro forum. And after that all things are messed-up.

Well, is a solution to make sure all the updates are made, but also when you sync mirrors have to use sudo. Try this one:
sudo pacman-mirrors -f && sudo pacman -Syyu

It's obvious I used sudo. But after that everything messed up. Many applications are not working. Is there any way to roll back the effect of mirror

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