OneJar doesn't work with rc1 or rc2 of gradle

[hani]

Error for RC2 is:

Execution failed for task ':client:oneJar'.

Could not find method addArtifact() for arguments [{getClassifier=com.smokejumperit.gradle.OneJarPlugin$_apply_closure5_closure11_closure13@438fed4a, getDate=com.smokejumperit.gradle.OneJarPlugin$_apply_closure5_closure11_closure14@1e23b7ed, getExtension=com.smokejumperit.gradle.OneJarPlugin$_apply_closure5_closure11_closure15@3b003810, getType=com.smokejumperit.gradle.OneJarPlugin$_apply_closure5_closure11_closure16@b60c0b3, getFile=com.smokejumperit.gradle.OneJarPlugin$_apply_closure5_closure11_closure17@7d0b2d9a, getName=com.smokejumperit.gradle.OneJarPlugin$_apply_closure5_closure11_closure18@68df1998}] on configuration ':client:archives'.

[breedx2]

I can confirm this bug still exists with Robert's OneJarPlugin and gradle 1.3. Wish it worked!