ios - Unable to run the app on iPod -

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i have app runs on iphone has ios 7.1 . when changed deployment target 6.1 , tried run app on ipod touch ,it giving me following error

 undefined symbols architecture armv7:  "std::__1::basic_streambuf<wchar_t, std::__1::char_traits<wchar_t> >::sync()", referenced from:  vtable std::__1::basic_stringbuf<wchar_t, std::__1::char_traits<wchar_t>, std::__1::allocator<wchar_t> > in libxl

could please tell me wrong?


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