You need a module to get the physics body ID.
If you look at the "Get Base Details" module, that outputs the objID which is the entities ID in the scene. Then you are plugging that into the Apply force for BodyID, BodyID refers to the physics id that the entity is using.
So try connecting a module of type Get body ID or use a graph like:
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Note, applying a force of 30 once to an entity on initialisation wont do much at all, since it is only a single tick.
Try applying it as a frame update to ensure it works.
Also the force, is a single float variable
Hope this helps