Error with Gradle: Could not get unknown property ‘project’ for ProductFlavor_Decorated

I’ve searched everywhere for this issue and I haven’t found a solution for this. I upgraded Gradle to version 6.7.1. While trying to sync Gradle for the first time after upgrading, I received this error:

Caused by: groovy.lang.MissingPropertyException: Could not get unknown property 'project' for ProductFlavor_Decorated{name=flavor1, dimension=null, minSdkVersion=null, targetSdkVersion=null, renderscriptTargetApi=null, renderscriptSupportModeEnabled=null, renderscriptSupportModeBlasEnabled=null, renderscriptNdkModeEnabled=null, versionCode=null, versionName=null, applicationId=null, testApplicationId=null, testInstrumentationRunner=null, testInstrumentationRunnerArguments={}, testHandleProfiling=null, testFunctionalTest=null, signingConfig=null, resConfig=[], buildConfigFields={}, resValues={}, proguardFiles=[], consumerProguardFiles=[], manifestPlaceholders={}, wearAppUnbundled=null} of type com.android.build.gradle.internal.dsl.ProductFlavor.
    at org.gradle.internal.metaobject.AbstractDynamicObject.getMissingProperty(AbstractDynamicObject.java:85)
    at org.gradle.internal.metaobject.AbstractDynamicObject.getProperty(AbstractDynamicObject.java:62)
    at com.android.build.gradle.internal.dsl.ProductFlavor_Decorated.getProperty(Unknown Source)
    at de.triplet.gradle.play.PlayPublisherPlugin$_apply_closure2.doCall(PlayPublisherPlugin.groovy:26)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.gradle.util.ClosureBackedAction.execute(ClosureBackedAction.java:71)
    at org.gradle.util.ConfigureUtil.configureTarget(ConfigureUtil.java:154)
    at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:105)
    at org.gradle.util.ConfigureUtil$WrappedConfigureAction.execute(ConfigureUtil.java:166)
    at org.gradle.configuration.internal.DefaultUserCodeApplicationContext$CurrentApplication$1.execute(DefaultUserCodeApplicationContext.java:100)
    at org.gradle.api.internal.DefaultCollectionCallbackActionDecorator$BuildOperationEmittingAction$1.run(DefaultCollectionCallbackActionDecorator.java:95)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71)
    at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71)
    at org.gradle.api.internal.DefaultCollectionCallbackActionDecorator$BuildOperationEmittingAction.execute(DefaultCollectionCallbackActionDecorator.java:92)
    at org.gradle.internal.ImmutableActionSet$SetWithFewActions.execute(ImmutableActionSet.java:285)
    at org.gradle.api.internal.DefaultDomainObjectCollection.doAdd(DefaultDomainObjectCollection.java:264)
    at org.gradle.api.internal.DefaultNamedDomainObjectCollection.doAdd(DefaultNamedDomainObjectCollection.java:113)
    at org.gradle.api.internal.DefaultDomainObjectCollection.add(DefaultDomainObjectCollection.java:253)
    at org.gradle.api.internal.AbstractNamedDomainObjectContainer.create(AbstractNamedDomainObjectContainer.java:79)
    at org.gradle.api.internal.AbstractNamedDomainObjectContainer.create(AbstractNamedDomainObjectContainer.java:71)
    at org.gradle.api.internal.NamedDomainObjectContainerConfigureDelegate._configure(NamedDomainObjectContainerConfigureDelegate.java:39)
    at org.gradle.internal.metaobject.ConfigureDelegate.invokeMethod(ConfigureDelegate.java:65)
    at build_vakvk2514duks3dkwbm106jz$_run_closure2$_closure14.doCall({project-directory}/app/build.gradle:81)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.gradle.util.ClosureBackedAction.execute(ClosureBackedAction.java:71)
    at org.gradle.util.ConfigureUtil.configureTarget(ConfigureUtil.java:154)
    at org.gradle.util.ConfigureUtil.configureSelf(ConfigureUtil.java:142)
    at org.gradle.api.internal.AbstractNamedDomainObjectContainer.configure(AbstractNamedDomainObjectContainer.java:91)
    at org.gradle.api.internal.AbstractNamedDomainObjectContainer.configure(AbstractNamedDomainObjectContainer.java:38)
    at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:103)
    at org.gradle.util.ConfigureUtil$WrappedConfigureAction.execute(ConfigureUtil.java:166)
    at com.android.build.gradle.internal.dsl.CommonExtensionImpl.productFlavors(CommonExtensionImpl.kt:197)
    at com.android.build.gradle.internal.dsl.BaseAppModuleExtension.productFlavors(BaseAppModuleExtension.kt)
    at com.android.build.gradle.internal.dsl.BaseAppModuleExtension_Decorated.productFlavors(Unknown Source)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.gradle.internal.metaobject.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:484)
    at org.gradle.internal.metaobject.BeanDynamicObject.tryInvokeMethod(BeanDynamicObject.java:196)
    at org.gradle.internal.metaobject.CompositeDynamicObject.tryInvokeMethod(CompositeDynamicObject.java:98)
    at org.gradle.internal.extensibility.MixInClosurePropertiesAsMethodsDynamicObject.tryInvokeMethod(MixInClosurePropertiesAsMethodsDynamicObject.java:34)
    at org.gradle.internal.metaobject.ConfigureDelegate.invokeMethod(ConfigureDelegate.java:56)
    at build_vakvk2514duks3dkwbm106jz$_run_closure2.doCall({project-directory}/app/build.gradle:80)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.gradle.util.ClosureBackedAction.execute(ClosureBackedAction.java:71)
    at org.gradle.util.ConfigureUtil.configureTarget(ConfigureUtil.java:154)
    at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:105)
    at org.gradle.util.ConfigureUtil$WrappedConfigureAction.execute(ConfigureUtil.java:166)
    at org.gradle.internal.extensibility.ExtensionsStorage$ExtensionHolder.configure(ExtensionsStorage.java:173)
    at org.gradle.internal.extensibility.ExtensionsStorage.configureExtension(ExtensionsStorage.java:64)
    at org.gradle.internal.extensibility.DefaultConvention.configureExtension(DefaultConvention.java:364)
    at org.gradle.internal.extensibility.DefaultConvention.access$500(DefaultConvention.java:45)
    at org.gradle.internal.extensibility.DefaultConvention$ExtensionsDynamicObject.tryInvokeMethod(DefaultConvention.java:301)
    at org.gradle.internal.metaobject.CompositeDynamicObject.tryInvokeMethod(CompositeDynamicObject.java:98)
    at org.gradle.internal.extensibility.MixInClosurePropertiesAsMethodsDynamicObject.tryInvokeMethod(MixInClosurePropertiesAsMethodsDynamicObject.java:34)
    at org.gradle.groovy.scripts.BasicScript$ScriptDynamicObject.tryInvokeMethod(BasicScript.java:134)
    at org.gradle.internal.metaobject.AbstractDynamicObject.invokeMethod(AbstractDynamicObject.java:163)
    at org.gradle.groovy.scripts.BasicScript.invokeMethod(BasicScript.java:83)
    at build_vakvk2514duks3dkwbm106jz.run({project-directory}/app/build.gradle:22)
    at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:91)
    ... 140 more

this is the product flavors:

flavorDimensions "brand", "environment"
productFlavors {
        flavor1 {
            dimension "brand"
            playAccountConfig = playAccountConfigs.defaultAccountConfig
            applicationId "com.flavor1.foo"
            buildConfigField("String", "productName", ""Flavor 1"")
        }
        flavor2 {
            dimension "brand"
            playAccountConfig = playAccountConfigs.defaultAccountConfig
            applicationId "com.flavor2.foo"
            buildConfigField("String", "productName", ""Flavor 2"")
        }
        iat {
            dimension "environment"
            buildConfigField("boolean", "IAT_ENVIRONMENT", "true")
        }
        prod {
            dimension "environment"
            buildConfigField("boolean", "IAT_ENVIRONMENT", "false")
        }
    }

I don’t understand what caused it to crash all of a sudden, it was working fine with Gradle version 5.6.4.

Answer

The problem was related to Gradle Play Publisher. I removed all lines related to com.github.triplet.play and now it is building. Hope this helps anyone who also had issues like I did.