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After migrating to Androidx packages using Android Studio menu option Refactor -> Refactor to Androidx...
I'm getting the following error:
Error inflating class androidx.constraintlayout.widget.ConstraintLayout 
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ConstraintLayout. A ConstraintLayout is a ViewGroup which allows you to position and size widgets in a flexible way. ConstraintLayout.LayoutParams. This class contains the different attributes specifying how a view want to be laid out inside a ConstraintLayout .
androidx.constraintlayout.widget.Barrier. Added in 1.1. A Barrier references multiple widgets as input, and creates a virtual guideline based on the most extreme widget on the specified side. For example, a left barrier will align to the left of all the referenced views.
These attributes are not applied at runtime, so if you push your layout on a device, the widgets may appear in a different location than shown in the editor. To fix this, make sure a widget has both horizontal and vertical constraints by dragging from the edge connections.
Make sure constraint layout is updated to latest version:
implementation 'androidx.constraintlayout:constraintlayout:2.1.3' And replace your xml tag names
<androidx.constraintlayout.ConstraintLayout> with
<androidx.constraintlayout.widget.ConstraintLayout> in every place where it appears using this shortcut:
Windows: CTRL + SHIFT + R
Mac: COMMAND + SHIFT + R
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In AndroidStudio 3.3 RC2 I got it resolved by upgrading -
implementation 'androidx.constraintlayout:constraintlayout:1.1.2' to
implementation 'androidx.constraintlayout:constraintlayout:1.1.3' in build.gradle (Module: app)
Note: This solution is also valid for the release version 3.3 (as per below comment by FireZenk), 3.5.2 (as per below comment by user2350644)
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