The most recent error I see is below (which is at the bottom of your webapp error log)- is that where you were looking? (ie. not the top)
2015-02-02 19:22:46,913 :Traceback (most recent call last):
2015-02-02 19:22:46,914 : File "/bin/user_wsgi_wrapper.py", line 130, in __call__
2015-02-02 19:22:46,914 : self.error_log_file.logger.exception("Error running WSGI application")
2015-02-02 19:22:46,914 : File "/usr/lib/python2.7/logging/__init__.py", line 1185, in exception
2015-02-02 19:22:46,915 : self.error(msg, *args, **kwargs)
2015-02-02 19:22:46,915 : File "/usr/lib/python2.7/logging/__init__.py", line 1178, in error
2015-02-02 19:22:46,915 : self._log(ERROR, msg, args, **kwargs)
2015-02-02 19:22:46,915 : File "/usr/lib/python2.7/logging/__init__.py", line 1270, in _log
2015-02-02 19:22:46,915 : record = self.makeRecord(self.name, level, fn, lno, msg, args, exc_info, func, extra)
2015-02-02 19:22:46,916 : File "/usr/lib/python2.7/logging/__init__.py", line 1244, in makeRecord
2015-02-02 19:22:46,916 : rv = LogRecord(name, level, fn, lno, msg, args, exc_info, func)
2015-02-02 19:22:46,916 : File "/usr/lib/python2.7/logging/__init__.py", line 284, in __init__
2015-02-02 19:22:46,916 : self.threadName = threading.current_thread().name
2015-02-02 19:22:46,916 : File "/usr/lib/python2.7/threading.py", line 1160, in currentThread
2015-02-02 19:22:46,917 : return _active[_get_ident()]
2015-02-02 19:22:46,917 : File "/bin/user_wsgi_wrapper.py", line 122, in __call__
2015-02-02 19:22:46,917 : app_iterator = self.app(environ, start_response)
2015-02-02 19:22:46,917 : File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in __call__
2015-02-02 19:22:46,917 : return self.wsgi_app(environ, start_response)
2015-02-02 19:22:46,917 : File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app
2015-02-02 19:22:46,918 : response = self.make_response(self.handle_exception(e))
2015-02-02 19:22:46,918 : File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app
2015-02-02 19:22:46,918 : response = self.full_dispatch_request()
2015-02-02 19:22:46,918 : File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1360, in full_dispatch_request
2015-02-02 19:22:46,919 : rv = self.handle_user_exception(e)
2015-02-02 19:22:46,919 : File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1358, in full_dispatch_request
2015-02-02 19:22:46,919 : rv = self.dispatch_request()
2015-02-02 19:22:46,919 : File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1344, in dispatch_request
2015-02-02 19:22:46,920 : return self.view_functions[rule.endpoint](**req.view_args)
2015-02-02 19:22:46,920 :TypeError: find_by_id() got an unexpected keyword argument 'track_ID'