added a message for pop up box with errors. Input is string which user will see in pop up box. New code is in newly created exceptions package.
added a message for pop up box with errors. Input is string which user will see in pop up box. New code is in newly created exceptions package.

ngbalk/VOOGASalad,JustinCarrao/voogasalad-final,JustinCarrao/voogasalad-final