Android Studio inline compiler showing red errors, but compilation with gradle works fine

Question

I\'ve set up my project in Android Studio to use the Square Wire library, as per this question.

Build -> Compile Project works fine.

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Answer 1

I had this problem after upgrading to Android Studio 3.1. I solved the issue by upgrading all the components I use. So I changed the following entries in my build.gradle (app):

1. Upgrade SDK (from "compileSdkVersion 25" to "compileSdkVersion 26" or maybe higher when you read this note):

   //compileSdkVersion 25

   compileSdkVersion 26

   Comment: This change forced program to download/install new sdk during next sync.

2. Upgrade appcompat-v7:

   //implementation 'com.android.support:appcompat-v7:25.4.0'

   implementation 'com.android.support:appcompat-v7:26.1.0'

3. Upgrade firebase:

   //implementation 'com.google.firebase:firebase-ads:11.4.2'

   implementation 'com.google.firebase:firebase-core:12.0.1'

   implementation 'com.google.firebase:firebase-ads:12.0.1'

4. In PROJECT build.gradle, upgrade google-services:

   //classpath 'com.google.gms:google-services:3.1.0'

   classpath 'com.google.gms:google-services:3.2.0'

5. Upgrade gradle (from 4.4 to 4.6). From gradle-wrapper.properties: distributionUrl=https://services.gradle.org/distributions/gradle-4.6-all.zip

After these changes, clean project, invalidate cache/restart, remove .idea/libraries content and resync (not sure about the order but ALL these activities solved the issue for me).