unable to build project over xml-rpc

It seems it is looking up the project ID as the builder:

2005-03-21 12:46:18,000 [Thread-10] INFO Continuum - Enqueuing 'Maven Wagon'.
2005-03-21 12:46:18,000 [Thread-10] INFO Continuum - Build id: '3'.
2005-03-21 12:46:18,031 [Thread-10] INFO Continuum - Enqueuing 'Maven Wagon API'.
2005-03-21 12:46:18,046 [Thread-10] INFO Continuum - Build id: '4'.
2005-03-21 12:46:18,125 [Thread-4] ERROR BuildController - Internal error while building the project.
org.codehaus.continuum.ContinuumException: No such builder: '1'.
at org.codehaus.continuum.builder.manager.DefaultBuilderManager.getBuilder(DefaultBuilderManager.java:76)
at org.codehaus.continuum.buildcontroller.DefaultBuildController.buildProject(DefaultBuildController.java:112)
at org.codehaus.continuum.buildcontroller.DefaultBuildController.build(DefaultBuildController.java:71)
at org.codehaus.continuum.BuilderThread.run(BuilderThread.java:70)
at java.lang.Thread.run(Thread.java:595)
2005-03-21 12:46:18,140 [Thread-4] ERROR BuildController - Internal error while building the project.
org.codehaus.continuum.ContinuumException: No such builder: '2'.
at org.codehaus.continuum.builder.manager.DefaultBuilderManager.getBuilder(DefaultBuilderManager.java:76)
at org.codehaus.continuum.buildcontroller.DefaultBuildController.buildProject(DefaultBuildController.java:112)
at org.codehaus.continuum.buildcontroller.DefaultBuildController.build(DefaultBuildController.java:71)
at org.codehaus.continuum.BuilderThread.run(BuilderThread.java:70)
at java.lang.Thread.run(Thread.java:595)