Search for Deactivated user

I need to reactivate all the Deactivated user. I am using getdeactivatedusersby() function but am getting error.

I have used this code:  getdeactivatedusersby("email","@",2).    but am getting error: "Expression evaluation error at function 'getdeactivatedusersby': Null argument not allowed" 

Can someone help what mistake am making.

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