I'm stuck. 
Please help! I'm having difficulty with the "set the close date to one month from today" portion.  I looked at a previous discussion and tried the suggested formulas - TODAY() +30, {!$System.OriginDateTime} +30, DATE(year, month+1,day), and DATE(YEAR(TODAY()),MONTH(TODAY())+1,DAY(TODAY())) yet I keep getting an error in my formula.
 

Hi friends,

I am writing sum trigger between two custom objects and program is saved but not executed properly like argument can't be null here i am passing values but it throws an error
 Trigger sum_of_amount on Employee__c(after insert,after update,after delete,after undelete)
 {
 List<Department__c> dept_amount=new List<Department__c>();
 set<id> Dept_id=new set<id>();
 for(Employee__c emp:trigger.new)
 {
 Dept_id.add(emp.deptid__c);
 }
 Decimal adding_amount;
 for(Department__c dept:[select id,deptname__c,(select id,EmpName__c,EmpSal__c from Employees__r) 
 from Department__c where id in:dept_id])
 {
 adding_amount=0;
 for(Employee__c emplist:dept.Employees__r)
 {
 system.debug('My Emp Salary value is +++++===='+emplist);
 adding_amount+=emplist.EmpSal__c;
 system.debug('Newly adding value is========++++++'+adding_amount);
 }
 dept.Total_amount__c=adding_amount;
 dept_amount.add(dept);
 }
 update dept_amount;
 }

hi
I want to send an automated email  to case Owner when the case Status field is not modified for certain period of time?

Could you please suggest the best way to achieve this?

Thanks
Ravi