Linker errors

Hi I'm a complete n00b to JUCE so apologies if I'm missing something painfully obvious. Just updated JUCE and rebuilt my project with the Introjucer, however when I try to build I get the following errors:

ld: warning: ignoring file /Applications/, file was built for i386 which is not the architecture being linked (x86_64): /Applications/

Undefined symbols for architecture x86_64:
  "GainerAudioProcessorEditor::displayPositionInfo(juce::AudioPlayHead::CurrentPositionInfo const&)", referenced from:
      GainerAudioProcessorEditor::timerCallback() in PluginEditor.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


Any help would be greatly appreciated, I'm running OSX 10.8.5 and XCode 5.0





Edit: I moved it, hopefully ot the right place! I'm using JUCE to try and build audio plugins....