Error importing gradle project

When I try to import a Gradle project like this:
New Project => Import project from external model => Gradle

I get this error: Can't resolve target gradle project at '/path/to/build.gradle'

My idea.log contains this stacktrace:

2012-02-22 20:04:25,665 [  18352]   INFO - ution.rmi.RemoteProcessSupport - 20:04:25.662 [RMI TCP Connection(3)-127.0.0.1] DEBUG org.gradle.tooling.GradleConnector - Connecting from tooling API consumer version 1.0-milestone-8a
2012-02-22 20:04:25,700 [  18387]   WARN - .plugins.gradle.util.GradleLog - Can't resolve gradle project. Reason: gradle api threw an exception:
java.lang.NoSuchMethodError: org.gradle.tooling.ModelBuilder.get()Lorg/gradle/tooling/model/Element;
 at org.jetbrains.plugins.gradle.remote.impl.GradleProjectResolverImpl.doResolveProjectInfo(GradleProjectResolverImpl.java:75)
 at org.jetbrains.plugins.gradle.remote.impl.GradleProjectResolverImpl.resolveProjectInfo(GradleProjectResolverImpl.java:54)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jetbrains.plugins.gradle.remote.impl.GradleApiFacadeImpl$1.invoke(GradleApiFacadeImpl.java:105)
 at $Proxy2.resolveProjectInfo(Unknown Source)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:303)
 at sun.rmi.transport.Transport$1.run(Transport.java:159)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
 at java.lang.Thread.run(Thread.java:662)