Error when try to open an alert properties:
An item with the same key has already been added. (mscorlib)
Cause: There are 2 (or more) jobs with the same name.
Find the duplicated names of jobs using this query:
select name, count(*) from msdb.dbo.sysjobs
group by name having count(*) > 1
Fix: Rename or delete one of the jobs with the duplicate name.
* Alerts can be executed by jobs, so maybe it caused an error when try to find this connection between alerts and jobs.
