ms access 2007 - Invalid use of null -


i hope last problem have database. wrote code: is averaging group of inputs. 

public sub calcoverallrating() dim li_calcvalue integer  if isnull((forms![frm_csr]![pp1]!cbx_pp1.value) or _            isnull(forms![frm_csr]![pp2]!cbx_pp2.value) or _            isnull(forms![frm_csr]![pp3]!cbx_pp3.value) or _            isnull(forms![frm_csr]![pp4]!cbx_pp4.value) or _            isnull(forms![frm_csr]![pp5]!cbx_pp5.value) or _            isnull(forms![frm_csr]![pp6]!cbx_pp6.value) or _            isnull(forms![frm_csr]![pp7]!cbx_pp7.value))     'don't calculate if values null else     li_calcvalue = (forms![frm_csr]![pp1]!cbx_pp1.value + _                     forms![frm_csr]![pp2]!cbx_pp2.value + _                     forms![frm_csr]![pp3]!cbx_pp3.value + _                     forms![frm_csr]![pp4]!cbx_pp4.value + _                     forms![frm_csr]![pp5]!cbx_pp5.value + _                     forms![frm_csr]![pp6]!cbx_pp6.value + _                     forms![frm_csr]![pp7]!cbx_pp7.value) / 7     forms![frm_csr].text270.value = li_calcvalue     forms![frm_csr].[overall csr].value = li_calcvalue end if  end sub

also have call calcoverallrating in each of forms names frm_pp1 through frm_pp7.

when use combobox comes error of invalid use of null. please help

you've included of conditions in first isnull() function. these should separated conditions:

if isnull(something) or isnull(somethingelse) ...

remove opening , closing parentheses.


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