[VBA] Excel 2010 Error 91

[devcon]

Καλησπέρα

Χρησιμοποιώ την ακόλουθη VBA για την εύρεση ονόματος. Στην περίπτωση που δεν υπάρχει το όνομα μου δίνει σφάλμα 91.
Θα παρακαλούσα κάποια βοήθεια.
Ευχαριστώ εκ των προτέρων.

'Attribute VB_Name = "FindText"
Sub FindText()

Dim i As Long
Dim Fnd As String
Dim fCell As Range
Dim ws As Worksheet
Dim Color As Long
Dim rngCurr As Range

    Fnd = InputBox("Enter text to search" & vbCr & vbCr _
            & "Click OK to search the entire workbook for all instances of the search text." & _
            " Each instance will be highlighted. This search is not case-sensitive, but it will not" & _
            " locate search text if its cell contains other text, including a formula.")

If Fnd = vbNullString Then
           Exit Sub
End If

Application.ScreenUpdating = False
Application.Dialogs(xlDialogPatterns).Show 'shows color palette
Color = ActiveCell.Interior.Color 'stores index number of selected color
ActiveCell.Interior.Color = xlNone
 'since previous line colors cell where cursor pointer is, this removes the shading from that cell
   
Application.ScreenUpdating = True

    Cells.Find(What:=Fnd, After:=ActiveCell, LookIn:=xlFormulas, LookAt _
        :=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, MatchCase:= _
        False, SearchFormat:=False).Activate
    With Selection.Interior
        .Pattern = xlSolid
        .PatternColorIndex = xlAutomatic
        .Color = Color
        .TintAndShade = 0
        .PatternTintAndShade = 0
    End With
        
first_pos = ActiveCell.Address 'first cell found

Cells.FindNext(After:=ActiveCell).Activate 'find the next cell if any

While ActiveCell.Address <> first_pos 'while nect cell is not the first one

    With Selection.Interior
        .Pattern = xlSolid
        .PatternColorIndex = xlAutomatic
        .Color = Color
        .TintAndShade = 0
        .PatternTintAndShade = 0
    End With
    Cells.FindNext(After:=ActiveCell).Activate
    
Wend

End Sub