Square LeakCanary Cannot find symbol

I am honestly surprised that

 dependencies {
   debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3'
   releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3'
 }

did not work for you, because it did for me.

Maybe you want to try it with your buildType instead of the productFlavour:

dependencies {
   someBuildTypeCompile 'com.squareup.leakcanary:leakcanary-android:1.3'
}

1. Make sure you add the libraries to your build.gradle

   dependencies {
       debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3.1'
       releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3.1'
   }
   

2. add mavenCentral() to your repositories

   buildscript {
       repositories {
           jcenter()
           mavenCentral()
       }
       dependencies {
            classpath 'com.android.tools.build:gradle:1.5.0'
       }
   }
   allprojects {
        repositories {
            jcenter()
            mavenCentral()
        }
   }
   

Rebuilding the project fixed it for me.

There's a deleted answer (I don't know why) by Kaushik Gopal that gives this solution and points to a Github issue