我的OFFSET数据验证公式有什么问题？

Question

我一直陷入OFFSET部分。当我手动尝试它时，它可以工作，当我用VBA尝试时它会卡住！

Range("C2").Activate
    With ActiveCell.Validation
    .Delete
    .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _
    xlBetween, Formula1:= _
    "=OFFSET(PARTSDB!$A$1;MATCH(CONCATENATE($E2;"" 
"";$F2);PARTSDB!$A:$A;0)-1;1;COUNTIF(PARTSDB!$A:$A;CONCATENATE($E2;"" 
"";$F2));1)"
    .IgnoreBlank = True
    .InCellDropdown = True
    .InputTitle = ""
    .ErrorTitle = "ERROR!!!"
    .InputMessage = ""
    .ErrorMessage = _
    "PART YOU ENTER DOESNT EXIST!!!"
    .ShowInput = True
    .ShowError = True
End With