Runtime Error Error from Companion: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase()' on a null object reference Dismiss

MIT App Inventor Help
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f52a18fb366e849550492bc59f67e65060e081e1_2_230x500
please solve this issue

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2 posts were merged into an existing topic: Error from companion

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Look closely at the URL for FirebaseDB8, in one of this poster's other threads.
Firebasedb8 So many components