Error duplicate symbol _EstimateBas64DecodedDataSize
<p>I want use Core-Plot to draw Pie Chart on my app.
I got following when add -ObjC and -all_load to Other Link Flags </p>

<p>ld: duplicate symbol _EstimateBas64DecodedDataSize in /Users/dongmh/Desktop/[P]ROJECT/SpendFunk/Source code/SVN new/SpendFunk/Twitter+OAuth/libOAuth.a(Base64Transcoder.o) and /Users/dongmh/Desktop/[P]ROJECT/SpendFunk/Source code/SVN new/SpendFunk/build/SpendFunk.build/Debug-iphonesimulator/SpendFunk.build/Objects-normal/i386/Base64Transcoder.o
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1</p>

<p>If don't add -ObjC and -all_load to Other Link Flags so work fine.
Any idea for this problem? Thanks so much!</p>
