'get a error msg when test myapp on ipod

I use xcode4 develop a base map app , i set a region use MKCoordinateRegionMakeWithDistance like follow:

self->map.hidden=NO; CLLocationCoordinate2D loc = CLLocationCoordinate2DMake([[NSNumber numberWithFloat:34.923964] doubleValue],[[NSNumber numberWithFloat:-120.219558] doubleValue]);

NSLog(@"%f",[[NSNumber numberWithFloat:34.923964] doubleValue]);

MKCoordinateRegion reg = MKCoordinateRegionMakeWithDistance(loc,[[NSNumber numberWithFloat:1000] doubleValue],[[NSNumber numberWithFloat:1000] doubleValue]);

self->map.region = reg;

when I'm trying to run a test of something I wrote, I get this message:

Undefined symbols for architecture armv7: "_CLLocationCoordinate2DMake", referenced from: -[MapViewController viewDidAppear:] in MapViewController.o ld: symbol(s) not found for architecture armv7 clang: error: linker command failed with exit code 1 (use -v to see invocation)

what does the message mean?

ios xcode

Solution 1:^[1]

Did you include the CoreLocation framework in your project?

Solution 2:^[2]

It's not finding the libs for CoreLocation for arm7. Possibly a corrupted Xcode install. I would suggest removing it, then reinstalling clean.

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Solution	Source
Solution 1	vinzee
Solution 2	picciano

'get a error msg when test myapp on ipod

Solution 1:[1]

Solution 2:[2]

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Solution 1:^[1]

Solution 2:^[2]