Failed to load AppCompat ActionBar with unknown error.Android Studio 3.1.3

Question

This was my first time using Android studio and I dont know what are those errors mean or what they implyenter image description here

[Render Problem Fa

Answer 1

Use stable version always

Always use stable version of libraries. If you are developing an app, you don't want to face these type of errors.

At the time of answering the current most stable version is 27.1.1 and second 28.0.0-rc02.

I suggest use 27.1.1 until 28 stable version release.

implementation 'com.android.support:appcompat-v7:27.1.1'

• Sync again
• No need of Invalidate/ Restart, Just restart would be okay. Or closing project and reopening from recent would be faster then restart.

Track the support library release.