Just after installing "osc", I get this error on first try:

cer@Telcontar:~/Projects/OSC> osc checkout home:robin_listas
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/osc/commandline.py", line 8273, in
_load_plugins
    mod = imp.load_source(modname, os.path.join(plugin_dir, extfile))
  File "/var/lib/osc-plugins/overview.py", line 47, in <module>
    @cmdln.option('-c', '--changelog', action='store_true',
NameError: name 'cmdln' is not defined

/var/lib/osc-plugins/overview.py: name 'cmdln' is not defined

 Try 'env OSC_PLUGIN_FAIL_IGNORE=1 osc ...'
cer@Telcontar:~/Projects/OSC> 

Changing the environment works, and so does removing osc-plugin-overview.rpm