Gradle 2.0-rc-1 problem

[workspace] $ [our jenkins home]/.jenkins/jobs/[our project]/workspace/gradlew --gradle-user-home=[our jenkins home]/.gradle --refresh-dependencies --no-search-upward --no-daemon build uploadArchives idea
Picked up _JAVA_OPTIONS: -Djava.io.tmpdir=[our jenkins home]/tmp
Downloading https://services.gradle.org/distributions/gradle-2.0-rc-1-bin.zip
.........................................[..]
Unzipping [our jenkins home]/.gradle/wrapper/dists/gradle-2.0-rc-1-bin/4rau6kski4dn6gj70iqn8pqs3c/gradle-2.0-rc-1-bin.zip to [our jenkins home]/.gradle/wrapper/dists/gradle-2.0-rc-1-bin/4rau6kski4dn6gj70iqn8pqs3c
Set executable permissions for: [our jenkins home]/.gradle/wrapper/dists/gradle-2.0-rc-1-bin/4rau6kski4dn6gj70iqn8pqs3c/gradle-2.0-rc-1/bin/gradle
To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: http://gradle.org/docs/2.0-rc-1/userguide/gradle_daemon.html.
Download [our nexus]/com/github/goldin/plugins/gradle/duplicates/0.3/duplicates-0.3.pom
Download [our nexus]/org/gcontracts/gcontracts-core/1.2.12/gcontracts-core-1.2.12.pom
Download [our nexus]/org/codehaus/gpars/gpars/1.0.0/gpars-1.0.0.pom
Download [our nexus]/com/github/goldin/plugins/gradle/common/0.3/common-0.3.pom
Download [our nexus]/com/fasterxml/jackson/core/jackson-databind/2.2.0/jackson-databind-2.2.0.pom
Download [our nexus]/org/spockframework/spock-core/0.7-groovy-1.8/spock-core-0.7-groovy-1.8.pom
Download [our nexus]/com/fasterxml/jackson/core/jackson-annotations/2.2.0/jackson-annotations-2.2.0.pom
Download [our nexus]/com/fasterxml/oss-parent/9/oss-parent-9.pom
Download [our nexus]/com/fasterxml/jackson/core/jackson-core/2.2.0/jackson-core-2.2.0.pom
Download [our nexus]/org/codehaus/groovy/groovy-all/1.8.8/groovy-all-1.8.8.pom
Download [our nexus]/com/github/goldin/plugins/gradle/duplicates/0.3/duplicates-0.3.jar
Download [our nexus]/org/gcontracts/gcontracts-core/1.2.12/gcontracts-core-1.2.12.jar
Download [our nexus]/org/codehaus/gpars/gpars/1.0.0/gpars-1.0.0.jar
Download [our nexus]/com/github/goldin/plugins/gradle/common/0.3/common-0.3.jar
Download [our nexus]/com/fasterxml/jackson/core/jackson-databind/2.2.0/jackson-databind-2.2.0.jar
Download [our nexus]/org/spockframework/spock-core/0.7-groovy-1.8/spock-core-0.7-groovy-1.8.jar
Download [our nexus]/com/fasterxml/jackson/core/jackson-annotations/2.2.0/jackson-annotations-2.2.0.jar
Download [our nexus]/com/fasterxml/jackson/core/jackson-core/2.2.0/jackson-core-2.2.0.jar
Download [our nexus]/org/codehaus/groovy/groovy-all/1.8.8/groovy-all-1.8.8.jar

FAILURE: Build failed with an exception.

* Where:
Build file '[our jenkins home]/.jenkins/jobs/[our project]/workspace/build.gradle'

* What went wrong:
Could not compile build file '[our jenkins home]/.jenkins/jobs/[our project]/workspace/build.gradle'.
> startup failed:
  Could not instantiate global transform class org.spockframework.compiler.SpockTransform specified at jar:file:[our jenkins home]/.gradle/caches/modules-2/files-2.1/org.spockframework/spock-core/0.7-groovy-1.8/3a677d19e8d3acf3bd296c4023356256d55da5a3/spock-core-0.7-groovy-1.8.jar!/META-INF/services/org.codehaus.groovy.transform.ASTTransformation  because of exception org.spockframework.util.IncompatibleGroovyVersionException: The Spock compiler plugin cannot execute because Spock 0.7.0-groovy-1.8 is not compatible with Groovy 2.3.2. For more information, see http://versioninfo.spockframework.org
  Spock location: file:[our jenkins home]/.gradle/caches/modules-2/files-2.1/org.spockframework/spock-core/0.7-groovy-1.8/3a677d19e8d3acf3bd296c4023356256d55da5a3/spock-core-0.7-groovy-1.8.jar
  Groovy location: file:[our jenkins home]/.gradle/wrapper/dists/gradle-2.0-rc-1-bin/4rau6kski4dn6gj70iqn8pqs3c/gradle-2.0-rc-1/lib/groovy-all-2.3.2.jar

  1 error