Visa informations (Lagos)

Hello
am amal from Morocco and i need an urgent informations
I need to come to Nigeria for work and on internet it says that i don t need a visa to enter nigeria but the nigerian embassy in morocco first time they said that i don t need it then i called back to get the vacination list that i need and they said that i need it so i am a little bit confused do i or don t i need a visa to enter nigeria ,am talking about normal one not neccessrly work visa bc am gona stay there for 1 to 3 months maximum please provide me with the informations urgently
Thank you