Uploading unexpected crash in kivy

main.py

def uploadCrash(crashstr):
	print "uploading crash to ", ui_elements.serverURL
	#req = UrlRequest('/listLevels', on_success=self.got_levels, timeout=1000)
	import urllib
	from kivy.network.urlrequest import UrlRequest
	params = urllib.urlencode({
	'version':__version__,
	"crashData":crashstr
	})
	headers = {'Content-type': 'application/x-www-form-urlencoded',
          'Accept': 'text/plain'}
	req = UrlRequest(ui_elements.serverURL+'/uploadCrash', on_success=None, req_body=params,
        req_headers=headers)
	req.wait()
	print "crash uploaded"

if __name__ == '__main__':
	try:
		KivEntEd().run()
	except:
		print "unexpected error"
		import traceback
		#traceback.print_exc()
		print "---"
		uploadCrash(traceback.format_exc())
		print "---"
		raise