Input sources missing All my input sources have disappeared.

I use Finnish, Japanese and Korean keyboards. For language switcher next clock on top menu-bar it shows "(NULL)" and "(NULL)" for Hiragana and Hangul input methods.

Other input sources like English are fine and still in place.

How can I re-install these?
Restart the computer, hold SHIFT before the apple logo show up, this will boot the Mac in safe mode, which will disable all other applications that are not required to start your Mac.  Note that this will take a few minutes. After this, try to locate the Input you need, it should be there.

If that fails, try the fix suggested by Apple.

If this fails, create a new Account.

祝你好运！！ (Good Luck!!)