ANTLR: reportAttemptingFullContext and reportContextSensitivity

I have come across these two messages when writing an ANTLR 4 grammar however I have no idea what they mean. When googling these terms I get the following explanation:

“This method is called when an SLL conflict occurs and the parser is about to use the full context information to make an LL decision.”

I don’t really understand what this means. What is it trying to tell me?

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