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By some circumstance, the thing you're using is hindering you. Usually it works, but now it's out of order and has a malfunction.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
パソコンの故障で仕事ができない。
I can't work because of my computer malfunction.
あのファックス機は故障中だよ。
That fax machine is out of order.
コウイチが百万ドルをかけて制作したワニカニロボットは、起動してから十秒で故障してしまいました。
The WaniKani robot that Koichi spent a million dollars to create, malfunctioned within ten seconds of starting up.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up whatever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.