package Ġcom . ud acity . aster oid . radar . domain . model Ċ Ċ import Ġcom . ud acity . aster oid . radar . domain . util . Constant Error Ċ Ċ data Ġclass ĠError Model ( ĊĠĠĠ Ġvar Ġmessage : ĠString ? Ġ= ĠConstant Error . ERROR Ċ )