Macro not running on protected worksheets

Hi All,
I need help. I am using the following codes first to protect all worksheets and then I run the code to unprotect all sheets to make some corrections.
When I run the Unprotect code after all worksheets have been protected, I am getting Run-time Error 1004 (all as hereunder.
I know I am missing something. Would anyone know what this something is please?

Thanks for help
paraxis

' Macro to protect multiple sheets

Option Explicit
Sub protectSheets()
    Dim i As Long
    For i = 1 To Sheets.Count
        Sheets(i).protect Password:="123"
    Next i
End Sub

                                                  
' Macro to unprotect multiple sheets

Sub UnProtectSheets()
 Dim i As Long
     For i = 1 To Sheets.Count
         Sheets(i).Unprotect Password:="123"
     Next i
 End Sub

Giving error
Run-time Error '1004'
The password you supplied is not correct. Verify that the CAPS LOCK key is off
and be sure to use the correct capitalisation.