When i save game on a npc conversation options e load this current save after, i receive "No Interaction object found!" error because this current talk interaction don't save together.
i have already look at remember scripts, but no one is (remember interaction), but after this error if i click on this npc again he execute the action i selected before.
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Please post some screenshots of the problem Conversation. It sounds like you have created dialogue options but not assigned an Interaction field for them - know that you can override the need for separate Interaction objects by clicking Override defaults? in the Dialogue: Start conversation Action (see this tutorial)
Note: When i load the game and choose a option, that error appears. Nothing happens, but when i click to interact (Talk) with npc, before the conversation dialog options appears the interaction choosen before start.
Try changing the Interaction source in the panel above to Asset File, and then back to In Scene, and see if that brings it back. Otherwise, you may have to delete the Conversation object and re-make it.