I had error "reactor already installed" after packing mine app with pyinstaller.
Traceback (most recent call last):
File "<string>", line 4, in <module>
File "c:\python27\lib\site-packages\kivy\support.py", line 176, in install_twisted_reactor
_threadedselect.install()
File "C:\Python27\lib\site-packages\twisted\internet\_threadedselect.py", line 354, in install
installReactor(reactor)
File "C:\Python27\lib\site-packages\twisted\internet\main.py", line 32, in installReactor
raise error.ReactorAlreadyInstalledError("reactor already installed")
twisted.internet.error.ReactorAlreadyInstalledError: reactor already installed