Microsoft VBScript runtime error '800a000d'

Type mismatch: '[string: ""]'

/events/partyrequestsub mit.asp, line 48

47 estr = estr & "Comments/Questions: " & request("commen ts") & vbcrlf

48 price = price + (4*request("ext raguests"))+(10 *request("numex trashirts"))+(1 0*numpizzas)+(r equest("tokens" )/4)+(1.5*request ("batting"))...