在打开的谷歌应用引擎启动器上发出警告

Question

我是新手。我已经成功安装了Google App Engine Launcher。我在这里给出了明确的每一步 https://askubuntu.com/questions/308534/google-app-engine-gui-launcher-for-ubuntu-13-04

当我尝试打开谷歌应用引擎启动器时，我收到了以下警告

$ ./GoogleAppEngineLauncher.py
WARNING:root:
  Warning: Prerequisites for App Engine development are missing!

  A valid python binary must be available.  In addition,
  the App Engine SDK must be installed.  Here are the current
  values we found:

    python = /usr/bin/python
    App Engine SDK root = None

  Please install the missing pieces and restart the launcher.
  If these are installed but the Launcher failed to find them,
  you can configure their location by editing Launcher preferences.

  The Launcher preferences can be modified by selecting Edit > Preferences.

请注意，我已经为python安装了Google App Engine SDK。

我尝试在Google应用引擎启动器中编辑首选项，但我无法点击“修改”选项。 好的应用引擎启动器无法正常工作。

我不明白这里出了什么问题？。请帮我解决这个警告。