I have created a static library to perform some mathematical operations libICodeMathUtils.a and add this static library with a .h file MathFunctions.h . But when I run my project then I am having this issue. You can see in this screen shot.

I have created a static library to perform some mathematical operations libICodeMathUtils.a and add this static library with a .h file MathFunctions.h . But when I run my project then I am having this issue. You can see in this screen shot.

I think your static library file is not compatible with simulator because simulator supports i386 so you have to create universal library (static fat library) check this Build fat static library (device + simulator) using Xcode and SDK 4+