"Live" Advanced Filter (for unique records)
 

While using the below vb I get nothing but #N/A
What am I doing wrong?

=IF(SUMPRODUCT(($A$2:$A$20<"")*1/COUNTIF($A$2:$A$20,$A$2:$A$20&""))<=COUNTA($B$1:$B 1)-1,"",INDEX($A$2:$A$20,MATCH(TRUE,ISERROR(MATCH($A$ 2:$A$20,$B$1:$B1,0)),0),1))

CSR UniqueNames
Test-5 #N/A
Test-5 #N/A
Test-10 #N/A
Test-10
Test-11