Why the following error when I deploy a function to firebase for realtime database

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TypeError: Cannot read property 'val' of undefined at exports.onDataAdded.functions.database.ref.onCreate.event (/user_code/index.js:5:28) at Object. (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27) at next (native) at /user_code/node_modules/firebase-functions/lib/cloud-functions.js:28:71 at __awaiter (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:24:12) at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:82:36) at /var/tmp/worker/worker.js:710:26 at process._tickDomainCallback (internal/process/next_tick.js:135:7) This is my structure

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javascriptfirebaseapple-push-notificationsgoogle-cloud-functions
Possible duplicate of Firebase TypeError: Cannot read property 'val' of undefined – Peter Haddad
Your question should include the source code that caused the error. As it stands now, this error could be referring to any invalid use of a property called val. – Doug Stevenson

1 Answers

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The error was due to the uses of deprecated things.FCM has been updated from beta to 1.0.0. Now the difference can be seen in the following documentation- https://firebase.google.com/docs/functions/beta-v1-diff#realtime-database