ImportError: No module named 'sage'

edit

I had a Sage 6.5 installed from the repository, running on my Fedora 22 nicely. But today when I went to run it I get the following error:

sage
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.5, Release Date: 2015-02-17                         │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
Traceback (most recent call last):
  File "/usr/lib64/sagemath/local/bin/sage-ipython", line 6, in <module>
    from sage.repl.interpreter import SageTerminalApp
ImportError: No module named 'sage'

I reinstalled Sage, but I still get the same error. Any ideas on why do I get this error and how to resolve it?