[error] Undefined symbols for architecture i386: ***

How to fix:

This problem was from 2 causes.

1.Unlink Library

 Check using library in your project.

 Build Phases -> Compile Sources -> Link Binary With Libraries

 QuartzCore.framewrok / libsqlite3.0.dyblib and so on.

2.Missed compile target file

 Check “Compile Sources” to all files show on this area.

 Build Phases -> Compile Sources

easy :)