In our system I see the same error when I monitor Json calls, however the user does not see this message.
Did you configure the configuration tables for the apps already?
In SIMGH try to find IMG structure:
- Create Sales Order
- Track Sales Orders
- Check Price and Availibility
In those structures you should find something regarding Maintain configuration parameters.
All parameters can be found in the Fiori install guide. (starting from page 49)
https://help.sap.com/saphelp_fiori/fiori10_install_en.pdf