Edit pull request : "an unexpected error occurred"

When editing a pull request, we have the following error : "An unexpected error occurred". The ajax request to https://bitbucket.org/!api/1.0/repositories/ccmbenchmark/ccmcms_linternaute/pullrequests/tasks/d9215818-3521-4692-99fc-634dbb4767b7?_=1450173236167 has a 500 HTTP status with the following content :

#!json

{"error": {"message": "[Errno 2] No such file or directory", "id": "8c52b9856f1c40c8995ee7624addeb18"}}

Actually all "Pull-Request POST" services seems broken, it seems to be related to this issue.