Traceback (most recent call last):

 "/usr/share/w3af/w3af/core/ui/gui/tools/manual_requests.py", line 126, in impact_done
raise impact.exceptionValueError: Invalid header name ''
Traceback (most recent call last):

 "/usr/local/src/w3af/w3af/core/ui/gui/main.py", line 612, in start_scan_wrap
real_scan_start()

 "/usr/local/src/w3af/w3af/core/ui/gui/main.py", line 603, in real_scan_start
self.w3af.start()

 "/usr/local/src/w3af/w3af/core/controllers/w3afCore.py", line 292, in start
self.scan_end_hook()

 "/usr/local/src/w3af/w3af/core/controllers/w3afCore.py", line 486, in scan_end_hook
om.manager.end_output_plugins()

 "/usr/local/src/w3af/w3af/core/controllers/output_manager/manager.py", line 316, in end_output_plugins
self.__end_output_plugins_impl()

 "/usr/local/src/w3af/w3af/core/controllers/output_manager/manager.py", line 342, in __end_output_plugins_impl
o_plugin.end()

 "/usr/local/src/w3af/w3af/plugins/output/json_file.py", line 65, in end
self.flush()

 "/usr/local/src/w3af/w3af/plugins/output/json_file.py", line 96, in flush
target_domain = cf.cf.get('target_domains')[0]IndexError: list index out of range