In Sheet1 I have the following formula in B149:

=IF(VLOOKUP(A149,MyClinics,3,FALSE),"Yes","No")

MyClinics is a named range on my sheet - Reference List

In My Define Ranges Dialog Box I have:
MyClinics with RefersTo: as:
='Reference List'!$A$115:$E$222

What are the other possibilities as to why I'm getting
nothing but #N/A returned?
TIA,,,