vba vlookup一問

各位大大好,我想問下vlookup出現下圖 #n/a 是正常嗎？附上vba碼。謝謝
  LR = Range("a1").End(xlDown).Row

  LLR = Range("b1").End(xlDown).Row
   For I = 4 To 40 Step 1


     Cells(I, 2) = "=VLOOKUP(a" & I & ",I:N,2,0)"
     Cells(I, 3) = "=VLOOKUP(a" & I & ",I:N,4,0)"
     Cells(I, 4) = "=VLOOKUP(a" & I & ",I:N,6,0)*100"
 Next I