ROS monocular camera_calibration error

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I am trying to calibrate an Orbbec Astra Pro with the ROS camera_calibration package on a Jetson TK1 running Ubuntu 14.04 with ROS indigo installed. I installed the ROS camera calibration binaries for ROS Indigo. While the calibration data is shown in the terminal after pressing calibrate, when I afterwards press the commit button I get the following error:

Unhandled exception in thread started by
sys.excepthook is missing
lost sys.stderr
sys.excepthook is missing
lost sys.stderr
Exception in thread Thread-2 (most likely raised during interpreter shutdown):Exception in thread Thread-7 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
  File "/opt/ros/indigo/lib/python2.7/dist-packages/camera_calibration/camera_calibrator.py", line 74, in run
Exception in thread Thread-5 (most likely raised during interpreter shutdown):<type 'exceptions.TypeError'>: 'NoneType' object is not callable
Traceback (most recent call last):

How can I solve this problem? Thank you!