ms access - error with multiple dlookup criteria -


this code produces runtime error 3464 dlookup matchstr_t. can't understand why matchstr_v seems work fine. offers? @ moment i'm trying use dlookup flag duplicate start times appointments. 

dim i, j, clientid, therid integer dim origin_date, apptdate  date dim slotday, apptype, venue, matchstr_v, matchstr_t string dim slottime date dim appt(25) date dim db database dim rst recordset dim test variant  origin_date = date slotday = me.slot_day.value slottime = me.slot_time.value clientid = me.client_id.value therid = me.therapist_id.value venue = me.venue.value apptype = "continuation"  slottime = format(slottime, "short time") = 1 7     apptdate = date +     if weekday(apptdate, 2) = slotday     'set stuff     j = 0 25         appt(j) = apptdate + (j * 7)          set db = currentdb()         set rst = db.openrecordset("dummy")          debug.print "[therapist id] = " & therid         matchstr_v = "[appt date]= #" & appt(j) & "# , [appt time] = #" & slottime & "# , [venue] = '" & venue & "'"         matchstr_t = "[appt date]= #" & appt(j) & "# , [appt time] = #" & slottime & "# , [therapist id] = " & therid         debug.print matchstr_t         if not isnull(dlookup("[dummy id]", "dummy", matchstr_v))             ' more stuff         elseif not isnull(dlookup("[dummy id]", "dummy", matchstr_t))             ' more stuff         else             rst.addnew             rst.fields("appt date") = appt(j)             rst.fields("appt time") = slottime             rst.fields("client id") = clientid             rst.fields("therapist id") = therid             rst.fields("appt type") = "continuation"             rst.fields("attendance") = "scheduled"             rst.fields("venue") = venue             'debug.print rst.fields("appt date")             rst.update             test = (dlookup("[dummy id]", "dummy", matchstr_v))             debug.print test         end if         rst.close         db.close     next j     else     end if next

what datatype of [therapist id]?

there seems datatype mismatch value of therid.


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