Don't worry about the first error - it just happens. If the ladders work in-game, fark it. According to FryGuy, ladders for FF will be func_ladders anyway.
With the second error, go to the enttiy it refers to (im pretty sure theres a button for that in the alt+p menu) and go to the 'Parent' property in that entity. The entity referred to as a parent is, as it said, missing. Maybe it was deleted, maybe it doesn't exist. If you don't want it to have a parent, just clear the entry in that property. When entity1 has entity2 as parent, whenever entity2 moves, entity1 will always move with it. That's how parents work.
Good luck!
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