Nigerian Resident Permit

Hey room ,a friend of mine wants to pay me a visit .the Nigerian embassy in LONDON required my resident permit.this is my first time to hear about that.I'm a Nigerian do i need resident permit.please advice me on what to do.i'm confused.
 This is what they required from me ,because i want to send a letter of invitation to my friend in UK.....................Application requirements: (a) One completed application form. (b) Passport. (c) One passport-size photo. (d) Fee, which at present must be paid by postal order. (e) Onward or return ticket for Tourist visas. (f) Paid registered post return envelope if applying by post. Business: (a)-(f) and, (g) Letter of introduction from a company or a resident of Nigeria, accepting immigration responsibility for applicant; any Nigerian inviting a visitor must attach photocopies of the first five pages of his/her own passport, while a resident must enclose a copy of his/her residence permit.DO I NEED RESIDENT PERMIT BEFORE I COULD INVITE SOMEONE TO NIGERIA?

am confused ohhhhhh..r u trying 2 visit Uk or is your friend in Uk trying to visit u in Nigeria...if da 2nd ? (question), is he/she a 9erian?