问题
I am developing Core-Location based iPhone application and there is some strange error.
When I send app in the background state and send it back to foreground, in main thread is error named MKNormalizedPointForLayer and nothing more.
Where I have to go to find solution? Google is poor about it.
来源：https://stackoverflow.com/questions/9766272/error-in-main-thread-mknormalizedpointforlayer