Cannot create purchase or Sales invoice

ERPNext Selling/CRM
3

I am using the virtual machine from the website with bench updates. It seems that the modules in Accounts are crashing with similar errors:

ImportError: No module named buying

ImportError: No module named selling

User setting have all modules enabled, and the user has access to them.

I wondered if the problem could be related to : https://discuss.frappe.io/t/customer-data-wont-load/11980

Screenshot: http://imgur.com/xZ7N1Ji

Thanks.