VBScript Runtime Error 800a000d

[mrmike]

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"))

49 estr = estr & "Estimated Price $" & price

I've got this error message and I cant seem to see where the problem is. someone give me a hand here, thanks.

[ashishm]

Please use CDbl or CInt functions.
for eg. 4*Cint(request( "extraguest s"))