Error in application environment

Hi,

During solving one of tasks the next error message appeared after pressing "Run and check" button:

Upon execvpe python2.7 ['python2.7', '/home/site/checkio/runners/py27.py', '8717f992722a482892f463c578c3585e', 'req', '2323'] in environment id 140430501761664
:Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/process.py", line 403, in _fork
    path, uid, gid, executable, args, environment)
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/process.py", line 453, in _execChild
    os.execvpe(executable, args, environment)
  File "/usr/local/lib/python2.7/os.py", line 355, in execvpe
    _execvpe(file, args, env)
  File "/usr/local/lib/python2.7/os.py", line 382, in _execvpe
    func(fullname, *argrest)
OSError: [Errno 2] No such file or directory

Thanks, Anton

From: https://www.checkio.org/mission/count-inversions/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0