How to fix Missing classes error in Android Studio | Missing constraints in constraint layout

Migrate to AndroidX from menu, it will replace package names and dependencies. Your project is adding widgets from Support libraries instead of AndroidX which is causing this ... You've mixed up AndroidX dependency with AppCompat . ... implementation 'androidx.constraintlayout:constraintlayout:1.1.3'.

2 answers

Gradle Sync failed could not find constraint-layout:1.0.0 ...

8 Oct 2016

Rendering Problems The following classes could not be found ...

24 Feb 2017

Android Studio 3.1.3 having issues with Constraint layout ...

15 Jun 2018

The following classes could not be found: - android.support ...

9 May 2020

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