Comment 2 for bug 1482752

When I execute the gtg command in the terminal; The error I get is the following:

$ gtg
2015-08-07 15:26:33,837 - WARNING - __init__:__init__:74 - Backend backend_evolution could not be loaded: No module named evolution
Traceback (most recent call last):
  File "/usr/bin/gtg", line 89, in <module>
    main()
  File "/usr/bin/gtg", line 85, in main
    sys.exit(gtg.main(options, args))
  File "/usr/share/gtg/GTG/gtg.py", line 121, in main
    ds, req = core_main_init(options, args)
  File "/usr/share/gtg/GTG/gtg.py", line 149, in core_main_init
    backends_list = BackendFactory().get_saved_backends_list()
  File "/usr/share/gtg/GTG/backends/__init__.py", line 174, in get_saved_backends_list
    self.restore_backend_from_xml(dic)
  File "/usr/share/gtg/GTG/backends/__init__.py", line 158, in restore_backend_from_xml
    dic["backend"] = module.Backend(dic)
  File "/usr/share/gtg/GTG/backends/backend_localfile.py", line 100, in __init__
    cleanxml.savexml(self.get_path(), self.doc, backup=True)
  File "/usr/share/gtg/GTG/tools/cleanxml.py", line 197, in savexml
    os.rename(zefile, tmpfile)
OSError: [Errno 13] Permission denied