I've upgraded a grails project from Grails 1.3.5 to Grails 2.0.0.RC1 and the Spock plugin from 0.5 to 0.6. and now have this error in tests:

```
| Server running. Browse to http://localhost:8080/appName
| Server stopped
| Tests FAILED  - view reports in target\test-reports
| Error Error executing script TestApp: java.lang.RuntimeException: Could
ad class in test type 'spock' (Use --stacktrace to see the full trace)

```