objective c - Xcode 4 - clang: error: linker command failed with exit code 1 (use -v to see invocation) -

i keep getting following error when trying build project. did google search , found folks had same name variables between classes and/or forgot include/had multiple inclusions of classes in linker, not case me.

please see below picture:

as says in error can't find main function. in ios project function comes template , looks this:

int main(int argc, char *argv[]) {     @autoreleasepool {         return uiapplicationmain(argc, argv, nil, nsstringfromclass([appdelegate class]));     } } 

it needed because main function entrance point every c, c++ , objective-c program. located in file called main.m in supporting files group (which doesn't mean you're not allowed move elsewhere).

to fix error, if file/the function exists. if do, open utilities pane (the right one), go first tab , if checkbox of target selected.