libdc1394 error: Failed to initialize libdc1394

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I installed OpenCV correctly on Ubuntu 14.04. However, when I run: import cv2 I get this error message:

>>> import cv2
libdc1394 error: Failed to initialize libdc1394

I read the answers fro a similar question, but all of them assume the existence of this file which I don't have: /dev/raw1394. So I installed the library:

sudo apt-get install libdc1394-22-dev libdc1394-22 libdc1394-utils

But still get the same error.

Note that this answer is the only one that works for me, however I can not pick it because I need to use camera in my application.

How can I resolve this ?

Thank you in advance. Begueradj