Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated{apkData=

Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated{apkData=Main{type=MAIN, fullName=debug, filters=[]}} of type com.android.build.gradle.internal.api.ApkVariantOutputImpl. Open File

android.applicationVariants.all { variant ->
variant.outputs.all { output ->
def outputFile = output.outputFile
if (outputFile != null && outputFile.name.endsWith('.apk')) {
def fileName = outputFile.name.replace("app",
"${defaultConfig.applicationId}_${defaultConfig.versionName}_${releaseTime()}")
outputFileName = fileName

}

}
}