Warning after compiling all

Hello, 

After compiling all (Version 8.3), the following warning occur. How can I resolve them?

BaseVisa.CrtNUI.cs 'BaseVisa_CrtNUIEventsProcess.SendEmail(Dictionary)' is obsolete CS0612 143 
EmployeeSchema.ZSDMAP.cs 'Employee_ZSDMAPEventsProcess.SavingScriptTaskExecute(ProcessExecutingContext)' hides inherited member 'Employee_CrtBaseEventsProcess.SavingScriptTaskExecute(ProcessExecutingContext)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword. CS0114 1457

Thanks.