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I am getting this error when I am compiling a program in Xcode.

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_MyDatabase", referenced from:
      objc-class-ref in Gallery_CollectionViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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1 Answer 1

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You have forgotten to add the source file that implements the class MyDatabase to the Xcode target and consequently it hasn't been compiled and linked with the binary.

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4 Comments

so what should I supposed to do now ?
@AshishPatil You need to add the file that implements MyDatabase to the binary target. See this SO answer for how to do that: stackoverflow.com/questions/5300785/…
m gettin following error now, what is this ? 0x12c3d35: movl 16(%edx), %edx Thread 1 : EXE_BAD_ACCESS
@AshishPatil That's a different issue. Ask a new question about that, and don't forget the symbolic stacktrace (i.e. type bt in the debugger console and post the output) and include the code around the lines that crashed.

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