Ionic Serve Runtime Error - Cannot read property 'map' of null

Yesterday it was working great… Today, I’m sad…
Can’t found any solution…

TypeError: Cannot read property ‘map’ of null
at splitDepsDsl (http://localhost:8100/build/vendor.js:9069:17)
at def (http://localhost:8100/build/vendor.js:11052:36)
at directiveDef (http://localhost:8100/build/vendor.js:11009:12)
at View_IonicApp_Host_0 (ng:///IonicModule/IonicApp_Host.ngfactory.js:6:63)
at proxyClass (http://localhost:8100/build/vendor.js:93963:29)
at resolveDefinition (http://localhost:8100/build/vendor.js:9113:17)
at ComponentFactory
.create (http://localhost:8100/build/vendor.js:10216:40)
at ComponentFactoryBoundToModule.create (http://localhost:8100/build/vendor.js:3690:29)
at ApplicationRef_.bootstrap (http://localhost:8100/build/vendor.js:5125:57)
at http://localhost:8100/build/vendor.js:4903:81

Thanks for posting this error message. It is a very great error message.

If you want help getting rid of it, please post a bit what you are doing, what your ionic info output looks like and any other information that might be relevant.

Error Solved… Updated my file package.json “too much”!
After some research, I manually wrote the old versions of peer dependencies needed and voilaaaa… Working again, zero errors! :slight_smile:
Hope my mistake of updating everything can help someone! :blush:

I had a similar error and it appeared ‘suddenly’. I updated all angular packages from 4.4.4 to 4.4.7 and zone.js from 0.8.17 to 0.8.26 and now it works again.

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