[求助]VBA中如何判断单元格是否为#N/A

我是用IERROR判断的呀，但还是报类型不匹配

看看我的代码

           For j = rowstart1 To rowend1                If IsError(Range("E" & j)) = False Then                    If Left(Replace(Range("E" & j), " ", ""), 3) = CStr(310) Then                        .Range("AB" & j + 1) = "80"                    Else                        .Range("AB" & j + 1) = "70"                    End If                Else                    If .Range("AA" & j + 1) > 0 Then                        .Range("AB" & j + 1) = "80"                    Else                        .Range("AB" & j + 1) = "70"                    End If                End If            Next j