Error Message Help - Functionality

Listed below are a series of functionality errors along with the screenshots and brief explanations:
 
Error creating receipt  – This error appears when the merchant account is not properly configured within the Groovv Register Application on your Android device
http://i.imgur.com/weWCeO2.png
Network Printer Error
http://i.imgur.com/ehjbfFo.png
Bluetooth Printer Error
http://i.imgur.com/LGwoDbc.png
USB Printer Error
http://i.imgur.com/PkyYia9.png
CC Error - The micro USB credit card swiper is unable to return value to a credit card. To perform a return a transaction must be associated. To perform these actions visit Transaction Detail or Transaction Lookup.
http://i.imgur.com/1oYdb4E.png
You must select a Table before starting a transaction - In order to begin placing an order, a table must first be selected and opened using the Table Select screen
http://i.imgur.com/uAB9pPu.png
Press [Server] button to log on first - Require server to login before a transaction has been enabled via System Data
http://i.imgur.com/MtyfSZw.png
Invalid Pin Entered - The incorrect PIN has been entered as a server/manager
http://i.imgur.com/yndrI9f.png
Clerk not Active - Clerk profile has been marked inactive and can no longer log into the Groovv Register application
http://i.imgur.com/vbtkZD1.png
Discount cannot be greater than subtotal - The value ($) discount can not exceed the total receipt subtotal
http://i.imgur.com/gtn3QNS.png
Error:java.lang.NullPointerException – 2 Potential Reasons for this:
You're tablet's screen is less than 10", in which case you must go to Settings, and switch to [Widescreen] orientation.
http://i.imgur.com/upOajay.png
No apps can perform this action - unable to email reports from Register Options Menu > Reports because there is no app with the ability to send emails
http://i.imgur.com/ibfiuvt.jpg
Error processing discount.  Can’t find last transaction. – Error applying % discount while logged in as a clerk in Training Mode.
http://i.imgur.com/c6u9p6t.png
Invalid Email - Email can not be used without error sending emailed receipts
http://i.imgur.com/GExDqOd.png
Invalid Email - Invalid email applied to a customer profile created on the tablet. Shown from the Finalize Screen.
http://i.imgur.com/8chmYSr.png
Invalid Email - Invalid email applied to a customer profile created in the Back Office
http://i.imgur.com/QsSFaed.png