title: Failed to load AppCompat ActionBar with unknown error. sdk 28 seems to be cause
body: <p>This is my gradle file where I make the changes but anything I do with SDK 28 doesn't help me but when I change it to 27. It works. Please help me to make it work with SDK 28. Thank you.<br>
  //This is my app gradle(Module:base)</p>
  
  <pre><code>apply plugin: 'com.android.feature'
  
  android {
      compileSdkVersion 28 //Change is made here
      baseFeature true
      defaultConfig {
          minSdkVersion 16
          targetSdkVersion 28 //Change is made here
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      api 'com.android.support:appcompat-v7:28.0.0-beta01'//Change is made here
      api 'com.android.support.constraint:constraint-layout:1.1.2'
      application project(':app')
      feature project(':project')
  }
  
  //If I change the SDK version to 27, it works. I really want to find out how to make it work in SDK version 28
  
  //Thank you for helping
  </code></pre>