java.lang.RuntimeException: Unable to start activity ComponentInfo{ng.org.fafic.fafic/ng.org.fafic.fafic.RegisterActivity}: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.

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This is caused by using legacy commands from older versions of Firebase. Look for the new documentation and try using only the new SDK

Solutions on the web

via Stack Overflow by Bright
, 1 year ago
Unable to start activity ComponentInfo{ng.org.fafic.fafic/ng.org.fafic.fafic.RegisterActivity}: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
via GitHub by KindTech
, 5 months ago
Unable to start activity ComponentInfo{com.myapp.app/com.myapp.app.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.myapp.app. Make sure to call FirebaseApp.initializeApp(Context) first.
via GitHub by aheadlcx
, 8 months ago
Unable to start activity ComponentInfo{net.wequick.example.small/net.wequick.example.small.app.main.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
via Stack Overflow by Leonid
, 1 year ago
Unable to start activity ComponentInfo{com.tech.te.app/com.tech.te.app.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
via teamtreehouse.com by Unknown author, 1 year ago
Unable to start activity ComponentInfo{com.teamtreehouse.stormy/com.teamtreehouse.stormy.ui.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
via Stack Overflow by James Jackson
, 2 years ago
Unable to start activity ComponentInfo{com.lofty.lofti/com.lofty.lofti.First}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
at com.google.firebase.auth.FirebaseAuth.getInstance(Unknown Source)
at ng.org.fafic.fafic.RegisterActivity.onCreate(RegisterActivity.java:35)
at android.app.Activity.performCreate(Activity.java:6374)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)

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