Ms Sql Select Count Distinct Probrem

I am trying to get the below query to work and can't seem to get past this error. Not sure but everywhere I look I think my syntax is right. I am probably missing something obvious but I'm just back from vacation and trying to get in the swing of things. Any help would be appreciated.


Select Distinct(chadcd) as Adjustor, Count (Distinct chclno) as NumberOfCases, Count (Distinct chclno,chwkno)as NumberofClauses
from clmhdr
where chpddt = '20040630'
Group By chadcd
Order by Adjustor

Server: Msg 170, Level 15, State 1, Line 1
Line 1: Incorrect syntax near ',chwkno'.

Count (Distinct chclno,chwkno)

the Count() agg function can only be applied one field at a time.
Count (Distinct chclno)

Al