Hi, what version of the jbpm-installer are you using? The most likely reason for the problem you are experiencing is that jbpm-installer comes with an older jBPM Designer version which is not able to parse the bpmn2 of the Evaluation process.
To upgrade your designer version:
1) in $jbpm-installer-dir/lib remove the designer war.
2) in $jbpm-installer-dir edit the build.properties file:
3) in $jbpm-installer-dir run:
Try again with the latest version and please report back any issues.
Hope this helps.
thank you very much.