gradle artifactory plugin

Question

I'm new to artifactory and teamcity. I tried using the gradle-artifactory plugin. but It is throwing me the following error.. can anybody pls tell what this error is about and help me with some solution.

Error is 
  Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention@9bb457' with class 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention' to class 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention'

My build.gradle is

buildscript {
repositories {
    maven {
        url "http://repo.jfrog.org/artifactory/gradle"
    }
    dependencies {
        classpath(group: 'org.jfrog.buildinfo', name: 'build-info-extractor-gradle', version: '2.0.12')
    }
}   
}

   apply plugin: 'artifactory'
   artifactoryPublish.skip = true

my gradle version is :gradle-1.0-milestone-8a

stackTrace is :

             [Gradle failure report] 
        [12:19:31][Gradle failure report] FAILURE: Build failed with an exception.
        [12:19:31][Gradle failure report] 
        [12:19:31][Gradle failure report] * Where:
        [12:19:31][Gradle failure report] Build file 'D:\Installations\Teamcity-7.1\TeamCity\buildAgent\work\5c4a802802673aca\account\build.gradle' line: 13
        [12:19:31][Gradle failure report] 
        [12:19:31][Gradle failure report] * What went wrong:
        [12:19:31][Gradle failure report] A problem occurred evaluating root project 'account'.
        [12:19:31][Gradle failure report] > Cannot cast object 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention@346762' with class 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention' to class 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention'
        [12:19:31][Gradle failure report] 
        [12:19:31][Gradle failure report] * Try:
        [12:19:31][Gradle failure report] Run with --info or --debug option to get more log output.
        [12:19:31][Gradle failure report] 
        [12:19:31][Gradle failure report] * Exception is:
        [12:19:31][Gradle failure report] org.gradle.api.GradleScriptException: A problem occurred evaluating root project 'account'.
        [12:19:31][Gradle failure report]   at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:54)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:127)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.BuildScriptProcessor.evaluate(BuildScriptProcessor.java:38)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:43)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:462)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:74)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.ProjectEvaluationConfigurer.execute(ProjectEvaluationConfigurer.java:23)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.ProjectEvaluationConfigurer.execute(ProjectEvaluationConfigurer.java:21)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.DefaultBuildConfigurer$1.execute(DefaultBuildConfigurer.java:38)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.DefaultBuildConfigurer$1.execute(DefaultBuildConfigurer.java:35)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.project.AbstractProject.configure(AbstractProject.java:438)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.project.AbstractProject.allprojects(AbstractProject.java:433)
        [12:19:31][Gradle failure report]   at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:35)
        [12:19:31][Gradle failure report]   at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:139)
        [12:19:31][Gradle failure report]   at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:110)
        [12:19:31][Gradle failure report]   at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:78)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.cli.RunBuildAction.execute(RunBuildAction.java:42)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.cli.RunBuildAction.execute(RunBuildAction.java:28)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:201)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:174)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.exec.ExceptionReportingAction.execute(ExceptionReportingAction.java:31)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.exec.ExceptionReportingAction.execute(ExceptionReportingAction.java:20)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.Main.doAction(Main.java:48)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.exec.EntryPoint.run(EntryPoint.java:45)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.Main.main(Main.java:39)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:32)
        [12:19:31][Gradle failure report]   at org.gradle.launcher.GradleMain.main(GradleMain.java:24)
        [12:19:31][Gradle failure report] Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention@346762' with class 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention' to class 'org.jfrog.gradle.plugin.artifactory.dsl.ArtifactoryPluginConvention'
        [12:19:31][Gradle failure report]   at org.jfrog.gradle.plugin.artifactory.ArtifactoryPlugin.getArtifactoryPluginConvention(ArtifactoryPlugin.groovy:126)
        [12:19:31][Gradle failure report]   at org.jfrog.gradle.plugin.artifactory.ArtifactoryPlugin$getArtifactoryPluginConvention.callCurrent(Unknown Source)
        [12:19:31][Gradle failure report]   at org.jfrog.gradle.plugin.artifactory.ArtifactoryPlugin.apply(ArtifactoryPlugin.groovy:43)
        [12:19:31][Gradle failure report]   at org.jfrog.gradle.plugin.artifactory.ArtifactoryPlugin.apply(ArtifactoryPlugin.groovy)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultProjectsPluginContainer.providePlugin(DefaultProjectsPluginContainer.java:107)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultProjectsPluginContainer.addPluginInternal(DefaultProjectsPluginContainer.java:71)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultProjectsPluginContainer.apply(DefaultProjectsPluginContainer.java:37)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.applyPlugin(DefaultObjectConfigurationAction.java:101)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.access$200(DefaultObjectConfigurationAction.java:32)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction$3.run(DefaultObjectConfigurationAction.java:72)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.execute(DefaultObjectConfigurationAction.java:114)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.project.AbstractProject.apply(AbstractProject.java:840)
        [12:19:31][Gradle failure report]   at org.gradle.api.Project$apply.call(Unknown Source)
        [12:19:31][Gradle failure report]   at org.gradle.api.internal.project.ProjectScript.apply(ProjectScript.groovy:34)
        [12:19:31][Gradle failure report]   at org.gradle.api.Script$apply.callCurrent(Unknown Source)
        [12:19:31][Gradle failure report]   at build_1u57rmsd94d5nc5gifnrrhi5j6.run(D:\Installations\Teamcity-7.1\TeamCity\buildAgent\work\5c4a802802673aca\account\build.gradle:13)
        [12:19:31][Gradle failure report]   at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:52)
        [12:19:31][Gradle failure report]   ... 29 more
        [12:19:31][Gradle failure report] 

I'm using teamcity 7.1 to run the build

Solution

Looks like a class loading problem. Maybe the plugin version isn't compatible with the Gradle version that you are using. I recommend to ask the authors of the plugin. Also let them know the Gradle version and the full stack trace (-S).