Odoo v9.0. with the wkhtmltopdf setup !

then when you have installed it , running v9.0 well , happy and then when you test e-commerce payment … something strange happened , you stuck at Pay Now and can’t proceed further …

and the odoo log file show … IOError …

then this may because you have changed the odoo default port 8069 to something else , so you must go to setting , system parameter ( you must activate developer mode ) , so that you can find this … and create a record as follow , add a parameter key report_url with value http://127.0.0.1:9099(your odoo v9.0. port)

and then retry the Pay Now, it should be able to proceed through payment already !

So Malaysia / Singapore SME , happy Odooing !