Hi I have added the module Sale Discount on Total Amountby Cybrosys Techno Solutions

SInce then i have this error when creating an invoice. I would really like to add a fixed amount discount to my quotations. Please advice.

Using this on a windows 7 PC with zero programming skills :(

Odoo Server ErrorTraceback (most recent call last): File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\http.py", line 648, in _handle_exception File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\http.py", line 685, in dispatch File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\http.py", line 321, in _call_function File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\service\model.py", line 118, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\http.py", line 314, in checked_call File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\http.py", line 964, in __call__ File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\http.py", line 514, in response_wrap File "C:\Program Files (x86)\Odoo 9.0-20170304\server\openerp\addons\web\controllers\main.py", line 888, in call_kw File "C:\Program Files (x86)\Odoo 9.0-20170304\server\openerp\addons\web\controllers\main.py", line 880, in _call_kw File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\api.py", line 250, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\api.py", line 381, in old_api File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\models.py", line 6083, in onchange File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\models.py", line 5940, in _onchange_eval File "C:\Program Files (x86)\Odoo 9.0-20170304\server\openerp\addons\account\models\account_invoice.py", line 447, in _onchange_invoice_line_ids File "C:\Program Files (x86)\Odoo 9.0-20170304\server\.\openerp\api.py", line 248, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20170304\server\openerp\addons\account\models\account_invoice.py", line 584, in get_taxes_values File "C:\Program Files (x86)\Odoo 9.0-20170304\server\openerp\addons\account\models\account_invoice.py", line 561, in _prepare_tax_line_valsKeyError: 'base'