OK now its sorted…
What I did was edit index.php file as mentioned here
https://community2.invoiceplane.com/t/topic/3870/8
Set my url to only subfolder, no need to add http://localhost/
I change my
define(‘IP_URL’, ‘http://localhost/invoice/’);
to
define(‘IP_URL’, ‘/invoice’);
I checked and can access my invoiceplane with 2 different computer in same network using wifi using static ip address.
computer a: h t t p://localhost/invoice
computer b: h t t p://192.168.x.x/invoice
(since as a new user here I can only put 2 links in a post, so i just put gap between http)