When choosing to do a rebuild of a build that used a copyartifact parameter, the following exception is raised:

java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.copyartifact.BuildSelector from

{"name":"SOURCE_BUILD","value":"<SpecificBuildSelector><buildNumber>122<\/buildNumber><\/SpecificBuildSelector>"}

at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:633)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:377)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:373)
at hudson.plugins.copyartifact.BuildSelectorParameter.createValue(BuildSelectorParameter.java:68)
at com.sonyericsson.rebuild.RebuildAction.doConfigSubmit(RebuildAction.java:186)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
(additional stack track removed)

Downgrading to rebuild 1.09 resolved the problem.