File Locked For Editing By 'User Name' On Save

Hello There

i have this code to run autofilter in protected sheet2, assigned to a check Box,
but it gives me this Msg when i run the code by checking the check Box :
File in use
The file is locked for editing by the (my name)

Any idea why is this ?

However, when i excute the code by F5 in the VBE window, it works fine
also when i excute the code from Worksheet_Activate , it works fine

here is the code:

Sub t()
With Sheet2
            .Protect "0", , , , userinterfaceonly:=True, Allowautofilter:=True
            .AutoFilterMode = False
            .Range("A5:DT5").AutoFilter
End With


End Sub

Re: File Locked For Editing By 'User Name' On Save

Thanks Dave, this helps