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i am facing error when i  am trying to count the no of tasks(created by app) on lead object 
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what should be value of filed agreegate nad realtionship field . is it possible to count the tasks with the rollup helper.please help!

thanks in advance!
If you have lookup field on Task to lead object then you can use rollup helper to count the tasks. In rollup helper you can't use WhoID field of task.
so what can i use here. we have lookup relationship beetween lead and tasks