JaCoCo test coverage Could not determine the dependencies of task ':createDebugAndroidTestCoverageReport'

Question

I have following problem during execution of 'gradle createDebugCoverageReport':

What went wrong: Could not determine the dependencies of task ':createDebugAndroidTestCoverageReport'. java.lang.NullPointerException (no error message)

Try: Run with --info or --debug option to get more log output.

Exception is:

org.gradle.api.GradleException: Could not determine the dependencies of task ':createDebugAndroidTestCoverageReport'.
    at org.gradle.api.internal.tasks.CachingTaskDependencyResolveContext.resolve(CachingTaskDependencyResolveContext.java:67)
    at org.gradle.api.internal.tasks.CachingTaskDependencyResolveContext.getDependencies(CachingTaskDependencyResolveContext.java:55)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.addToTaskGraph(DefaultTaskExecutionPlan.java:139)
    ...
Caused by: java.lang.NullPointerException
    at com.android.build.gradle.internal.variant.BaseVariantData.getJavaSourceFoldersForCoverage(BaseVariantData.java:682)
    at com.android.build.gradle.internal.coverage.JacocoReportTask$ConfigAction.lambda$execute$3(JacocoReportTask.java:335)
    at org.gradle.util.GUtil.uncheckedCall(GUtil.java:401)

I've tried all of the hints from: How do I get a jacoco coverage report using Android gradle plugin 0.10.0 or higher?. The only difference is that I'm using the experimental gradle plugin in version 0.8.3.

buildscript {

  repositories {

      jcenter()
      maven { url 'https://plugins.gradle.org/m2/' }
  }

  dependencies {

      classpath 'com.android.tools.build:gradle-experimental:0.8.3'
  }
}

allprojects {

  repositories {

    jcenter()
  }
}

apply plugin: 'com.android.model.application'
apply plugin: "jacoco"

model {

  android {
      compileSdkVersion 25
      buildToolsVersion "25.0.2"

      defaultConfig {

        applicationId ...
        minSdkVersion.apiLevel 21
        targetSdkVersion.apiLevel 25

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }

      buildTypes {
          ...
          debug {

            debuggable true
            testCoverageEnabled true
          }
      }

      testOptions.unitTests {
           returnDefaultValues = true
      }
  }

  android.sources {
    ...
    test {
        java {
            source {
                srcDir "UnitTests"
            }
        }
    }

    androidTest {
        java {
            source {
                srcDir "AutomationTests"
            }
        }
    }
  }
}

dependencies {
  ...
}

Any idea? Thanks.