Should we access the spirit world?

Many people have the impression that all prophets and prophecy are hoaxes or simply untrue.  We have all heard of people who are well known psychics, or prophets etc.  However we know for a prophet to be considered a true prophet they have to be correct 100% of the time. Well known psychics like Nostradamus were not correct all the time which would mean he was not a prophet of God. Not to say he wasn’t getting accurate information from somewhere but it wasn’t from God.  We KNOW God doesn’t make mistakes EVER. 

God doesn’t tell us that we cant access the the spirit world, he states very matter of factly that we are not to attempt to get this information as no good comes from this knowledge. This is a basis for the Tree of Knowledge that Eve ate from or accessed in the Book of Genesis, to be more accurate.   This more correctly confirms that there is a spirit world that we are not to access NOT that one doesn’t exist.   He is simply warning us to stay away from it. In saying that do you think psychics and fortune tellers are accessing the tree of knowledge we arent to access??