Created new module for reporting in sale order.Getting  error when click on print button in log file in odoo. Plz Help

IOError: [Errno url error] unknown url type: 'c'

2015-05-08 11:17:28,118 4200 ERROR odoo openerp.addons.web.controllers.main: An exception occured during an http request

Traceback (most recent call last):

File "C:\Program Files\Odoo 8.0-20141009-000215\server\openerp\addons\web\controllers\main.py", line 69, in wrap

File "C:\Program Files\Odoo 8.0-20141009-000215\server\openerp\addons\web\controllers\main.py", line 1570, in index

File "C:\Program Files\Odoo 8.0-20141009-000215\server\.\openerp\http.py", line 807, in proxy_method

File "C:\Program Files\Odoo 8.0-20141009-000215\server\.\openerp\http.py", line 100, in dispatch_rpc

File "C:\Program Files\Odoo 8.0-20141009-000215\server\.\openerp\service\report.py", line 34, in dispatch

File "C:\Program Files\Odoo 8.0-20141009-000215\server\.\openerp\service\report.py", line 141, in exp_report_get

File "C:\Program Files\Odoo 8.0-20141009-000215\server\.\openerp\service\report.py", line 119, in _check_report

except_orm: (u'url error\nunknown url type', (<type 'exceptions.IOError'>, IOError('url error', 'unknown url type'), <traceback object at 0x232E9120>))

2015-05-08 11:17:28,118 4200 WARNING odoo openerp.http: <function openerp.addons.web.controllers.main.index> returns an invalid response type for an http request

2015-05-08 11:17:28,119 4200 INFO odoo werkzeug: 127.0.0.1 - - [08/May/2015 11:17:28] "POST /web/report HTTP/1.1" 500 -

2015-05-08 11:17:30,582 4200 INFO odoo werkzeug: 127.0.0.1 - - [08/May/2015 11:17:30] "POST /longpolling/poll HTTP/1.1" 200 -

2015-05-08 11:17:59,403 4200 INFO odoo werkzeug: 127.0.0.1 - - [08/May/2015 11:17:59] "POST /longpolling/poll HTTP/1.1" 200 -

2015-05-08 11:18:03,437 4200 INFO odoo werkzeug: 127.0.0.1 - - [08/May/2015 11:18:03] "POST /longpolling/poll HTTP/1.1" 200 -

2015-05-08 11:18:20,901 4200 INFO odoo werkzeug: 127.0.0.1 - - [08/May/2015 11:18:20] "POST /longpolling/poll HTTP/1.1" 200 -