This error is displayed because Android 4.4 is not supported by FooSales. Updating to a newer version of Android should solve this problem. Please refer to the Android minimum requirements.
Common Issues: Have you installed and activated the FooSales WordPress plugin? Was your URL entered correctly? Did you enter the correct username and password? Does the WordPress user have appropriate permissions? Do you have any security plugins installed? Do you use a CAPTCHA plugin? Is REST API accessible? Is your site installed in a subdirectory
The FooSales iPad and Android tablet apps connect to your store using REST API (primary) or WordPress XML-RPC (secondary). REST API is the preferred connection method as it is generally more stable and secure than XML-RPC. In certain server environments, you might not be able to use the REST API and your web host or