Undefined Symbols for Architecture i386

[resolved]: did not set correct settings of build targets, , why getting error. "red text" apparently caused bug in xcode 4, not go away when build successfully.

getting error below when try build. building ios app. idea why happening?

code:

undefined symbols architecture i386:   "_objc_class_$_sdwebimagemanager", referenced from:       objc-class-ref in viewcontroller.o ld: symbol(s) not found architecture i386 clang: error: linker command failed exit code 1 (use -v see invocation)

i using olivier poitrey's sdwebimage static library: https://github.com/rs/sdwebimage

here build phases:


note: problem might red text, meaning compiler cannot locate .a file. supposedly, file produced when library built. however, can not seem find anywhere when build sdwebimage library separately.

 

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