Cannot start semantic capability

```
$ roslaunch capabilities demo.launch --screen

[...]

process[capability_server-2]: started with pid [949]
[WARN] [WallTime: 1381481890.200426] No default provider given for capability interface 'minimal_pkg/Minimal'. 
[WARN] [WallTime: 1381481890.200671] 'minimal_pkg/Minimal' has only one provider, 'minimal_pkg/minimal', using that as the default.
[WARN] [WallTime: 1381481890.201997] No default provider given for capability interface 'minimal_pkg/SpecificMinimal'. 
[WARN] [WallTime: 1381481890.202152] 'minimal_pkg/SpecificMinimal' has only one provider, 'minimal_pkg/specific_minimal', using that as the default.
[INFO] [WallTime: 1381481890.202304] For each available interface, the default provider:
[INFO] [WallTime: 1381481890.202457] 'minimal_pkg/Minimal'
[INFO] [WallTime: 1381481890.202597]   => 'minimal_pkg/minimal'
[INFO] [WallTime: 1381481890.202742] 
[INFO] [WallTime: 1381481890.202877] 'minimal_pkg/SpecificMinimal'
[INFO] [WallTime: 1381481890.203012]   => 'minimal_pkg/specific_minimal'
[INFO] [WallTime: 1381481890.203149] 
[INFO] [WallTime: 1381481890.215100] Capability Server Ready
[INFO] [WallTime: 1381481937.935397] Request to start capability 'minimal_pkg/SpecificMinimal'
[ERROR] [WallTime: 1381481937.936255] RuntimeError: Capability 'minimal_pkg/SpecificMinimal' not found.
```

Am I missing something?