Trouble using JoinFieldValue function
                     I'm trying to get the email address of the Account Owner and the Account Owner's manager using the JoinFieldValue function.  Here is what i have, but keep getting a syntax error.  Please help.  
                JoinFieldValue('<OwnerEMailAddr>', JoinFieldValue('<Account>', [<AccountId>], '<OwnerId>'),'<OwnerEMailAddr>')
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