X_SHOT_ISLAND_UNSTUBBED_REQUEST
Means
the component requested something no state stub answers
Typical cause
the picture would show a fixture gap dressed up as a component state. Every address is sealed: an unmatched request is refused by name rather than allowed to hang
Fix
in the states file add to that state a route: routes: [{ match: 'GET /api/x', respond: { kind: 'json', body: {} } }]