I need gevent to run docker-registry but i have this error:Error: class uri 'gevent' invalid or not found: [Traceback (most recent call last):  File /usr/local/lib/python2.7/dist-packages/gunicorn/util.py, line 139, in load_class    mod = import_module('.'.join(components))  File /usr/lib/python2.7/importlib/__init__.py, line 37, in import_module    __import__(name)  File /usr/local/lib/python2.7/dist-packages/gunicorn/workers/ggevent.py, line 22, in <module>    raise RuntimeError(You need gevent installed to use this worker.)RuntimeError: You need gevent installed to use this worker.]I tried to install gevent with apt-get and pip but when run the command, have always this errorUPDATE:Debian 7.8 64 bitOutput of dpkg -l | grep pythonii  libpython2.6                       2.6.8-1.1                     amd64        Shared Python runtime library (version 2.6)ii  libpython2.7                       2.7.3-6+deb7u2                amd64        Shared Python runtime library (version 2.7)ii  python                             2.7.3-4+deb7u1                all          interactive high-level object-oriented language (default version)ii  python-all                         2.7.3-4+deb7u1                all          package depending on all supported Python runtime versionsii  python-all-dev                     2.7.3-4+deb7u1                all          package depending on all supported Python development packagesii  python-apt                         0.8.8.2                       amd64        Python interface to libapt-pkgii  python-apt-common                  0.8.8.2                       all          Python interface to libapt-pkg (locales)ii  python-chardet                     2.0.1-2                       all          universal character encoding detectorii  python-debian                      0.1.21                        all          Python modules to work with Debian-related data formatsii  python-debianbts                   1.11                          all          Python interface to Debian's Bug Tracking Systemii  python-dev                         2.7.3-4+deb7u1                all          header files and a static library for Python (default)ii  python-fpconst                     0.7.2-5                       all          Utilities for handling IEEE 754 floating point special valuesii  python-gevent                      0.13.6-1+nmu3                 amd64        gevent is a coroutine-based Python networking libraryii  python-greenlet                    0.3.1-2.5                     amd64        Lightweight in-process concurrent programmingii  python-minimal                     2.7.3-4+deb7u1                all          minimal subset of the Python language (default version)ii  python-pip                         1.1-3                         all          alternative Python package installerii  python-pkg-resources               0.6.24-1                      all          Package Discovery and Resource Access using pkg_resourcesii  python-reportbug                   6.4.4+deb7u1                  all          Python modules for interacting with bug tracking systemsii  python-setuptools                  0.6.24-1                      all          Python Distutils Enhancements (setuptools compatibility)ii  python-soappy                      0.12.0-4                      all          SOAP Support for Pythonii  python-support                     1.0.15                        all          automated rebuilding support for Python modulesii  python2.6                          2.6.8-1.1                     amd64        Interactive high-level object-oriented language (version 2.6)ii  python2.6-dev                      2.6.8-1.1                     amd64        Header files and a static library for Python (v2.6)ii  python2.6-minimal                  2.6.8-1.1                     amd64        Minimal subset of the Python language (version 2.6)ii  python2.7                          2.7.3-6+deb7u2                amd64        Interactive high-level object-oriented language (version 2.7)ii  python2.7-dev                      2.7.3-6+deb7u2                amd64        Header files and a static library for Python (v2.7)ii  python2.7-minimal                  2.7.3-6+deb7u2                amd64        Minimal subset of the Python language (version 2.7)
RuntimeError: You need gevent installed to use this worker
python