There you go:

14:25:26 DUMP of alive_mission_data on end any
14:25:26 Error in expression <UMP of alive_mission_data on start %1", alive_mission_data];

private _aliveKey >
14:25:26   Error position: <alive_mission_data];

private _aliveKey >
14:25:26   Error Undefined variable in expression: alive_mission_data

...or is it namespaced somewhere in particular?

BTW re-tried everything again today. First time saving on a NEW mission, it works. Second time, never. Does anyone know eventually an alternative persistent system compatible with ALiVE?