The application "Navigator" can't be opened

Question

When I click on the navigator it says, The application "Navigator" can't be opened How can I fix this? It was completely fine few days ago and now I am trying to open it again and it says this suddenly. I tried updating it but still no result.
I am using Mac book OS Sierra version 10.12.3.

I tried updating the anaconda and navigator still not working

conda update anaconda
conda update anaconda-navigator

command line : anaconda-navigator gives

Traceback (most recent call last):
  File "//anaconda/bin/anaconda-navigator", line 4, in <module>
    import anaconda_navigator.app.main
  File "//anaconda/lib/python2.7/site-packages/anaconda_navigator/app/main.py", line 16, in <module>
    from qtpy.QtCore import QCoreApplication, QEvent, QObject, Qt
  File "//anaconda/lib/python2.7/site-packages/qtpy/__init__.py", line 129, in <module>
    raise PythonQtError('No Qt bindings could be found')
qtpy.PythonQtError: No Qt bindings could be found

Answer 1

Have you tried launching from the command line? You can simply type:

anaconda-navigator

If you continue to have issues opening it this will at least provide a more descriptive traceback.