it means your shape class doesnt have a method called alloc in its interface. Is this for a treehouse challenge or video? if so please provide a link

http://teamtreehouse.com/library/objectivec-basics/introduction-to-objectivec/inheritance here

did you import your Shape.h in main.m? does your shape class inherit from NSObject?

import <Cocoa/Cocoa.h>

import "shape.h"

int main() { shape *shape = [[shape alloc] init];

return 0;

}

here

import <Cocoa/Cocoa.h>

import "shape.h"

int main() { shape *shape = [[shape alloc] init];

return 0;

}

im sorry its acting funny

import <Cocoa/Cocoa.h>

import "shape.h"

int main() { shape *shape = [[shape alloc] init];

return 0;

ill try that

well that failed and i think thats because the file shape.h is uncapitalized