can't run perfect

[lilongcnc]

I run Peckham successed! Then I create a file name 'Person'm ,and I import header file 'Person.h' by Peckham successs,but when write code 'Person *p1= [[Person alloc ] init]', XCdoe doesn't Intelligent prompt 'Person' class. I try in my company Mac Book pro and my home Mac Book pro,have the same result