Excel vba error 1004 - insert a formula - vba

Question

i'm trying to execute these code in my excel sheet
ActiveCell.Offset(0, 3).Formula = "=if(SUM(N" & i + 2 & ":N" & i + 5 & ")>0;MEDIAN(N" & i + 2 & ":N" & i + 5 & ");0)"
and i'm get an #1004 error with no more informations. Can anybody eyplain my failure?
I hav some others formulars insert in the same way...thx
EDIT:
My Tables look like that
This should be a projectmanagement tool - Breitband Delphi Method ;)
So my code goes through all the rows and check in which column the descripton is (level 1,2,3,4).
Next the code is adding the rows 8-12 for example.. here i can enter some informations for the project... and now my script should add the formula at column k-n.
My code is not very nice (as my english :) ) - it is just a prototype..
This is my Loop
i = 5
canSkip = False
Do
' fist first the level
If Not IsEmpty(Range("B" & i).Value) Then
level = 1
If Not IsEmpty(Range("D" & i + 1)) Then
' ye we can - so skip this loop
canSkip = True
End If
ElseIf Not IsEmpty(Range("D" & i).Value) Then
level = 2
If Not IsEmpty(Range("F" & i + 1)) Then
' ye we can - so skip this loop
canSkip = True
End If
ElseIf Not IsEmpty(Range("F" & i).Value) Then
level = 3
If Not IsEmpty(Range("H" & i + 1)) Then
' ye we can - so skip this loop
canSkip = True
End If
ElseIf Not IsEmpty(Range("H" & i).Value) Then
level = 4
canSkip = False
End If
If canSkip = True Then
i = i + 1
Else
' First insert some... and bang it to a group
' Insert Formula
Range("K" & i).Activate
ActiveCell.Formula = "=min(L" & i + 2 & ":L" & i + 5 & ")"
ActiveCell.Offset(0, 1).Formula = "=max(L" & i + 2 & ":L" & i + 5 & ")"
'Range("T1").FormulaLocal = insertMedianFormula
'ActiveCell.Offset(0, 3).Formula = "=WENN(SUMME(N" & i + 2 & ":N" & i + 5 & ")>0;MITTELWERT(N" & i + 2 & ":N" & i + 5 & ");0)"
Range("A" & i + 1).Activate
For x = 1 To 5
ActiveCell.EntireRow.Insert
If x = 5 Then
If level = 1 Then
ActiveCell.Offset(0, 1).Value = "Experte"
ActiveCell.Offset(0, 2).Value = "Aufw."
ActiveCell.Offset(0, 3).Value = "Bemerkung"
ElseIf level = 2 Then
ActiveCell.Offset(0, 3).Value = "Experte"
ActiveCell.Offset(0, 4).Value = "Aufw."
ActiveCell.Offset(0, 5).Value = "Bemerkung"
ElseIf level = 3 Then
ActiveCell.Offset(0, 5).Value = "Experte"
ActiveCell.Offset(0, 6).Value = "Aufw."
ActiveCell.Offset(0, 7).Value = "Bemerkung"
ElseIf level = 4 Then
ActiveCell.Offset(0, 7).Value = "Experte"
ActiveCell.Offset(0, 8).Value = "Aufw."
ActiveCell.Offset(0, 9).Value = "Bemerkung"
End If
' now just bang it to a group
ActiveCell.Resize(5, 10).Rows.Group
End If
Next x
i = i + 6
End If
' are we finshed?
If i > lastUsedRow Then
Exit Do
End If
canSkip = False
Loop

Answer 1

Original formula (MS standard) uses "," instead of ";"
ActiveCell.Offset(0, 3).Formula = "=IF(SUM(N" & i + 2 & ":N" & i + 5 & ")>0,MEDIAN(N" & i + 2 & ":N" & i + 5 & "),0)"
or use:
ActiveCell.Offset(0, 3).FormulaLocal = "=IF(SUM(N" & i + 2 & ":N" & i + 5 & ")>0;MEDIAN(N" & i + 2 & ":N" & i + 5 & ");0)"
Please, refer this:
Formula
FormulaLocal
[EDIT]
First of all...
IsEmpty indicates whether a variable (of variant) has been initialized. So, if you want to check if cell is empty (does not contains any value), use:
Range("B" & i)<>""
Second of all..
Your code has no context. What it means? Using ActiveCell or Range("") or Cell() depends on what workbook (and its sheet) is actually in usage!
You should use code in context:
With ThisWorkbook.Worksheets("SheetName")
.Range("A1").Offset(0,i).Formula = "='Hello Kitty'"
.Cell(2,i) = "123.45"
End With
Third of all...
Review and debug you code and start again using above tips ;)