I'm trying to point my program to read a file from a specific directory. Everytime I try to fix this problem to stop the error, I keeps coming back, and I just can't figure out what's happening...

Code:
Try
            'Navigate to 
            fileReader = My.Computer.FileSystem.ReadAllText(My.Computer.FileSystem.SpecialDirectories.MyDocuments) + "\sandwich\" + sandwichtypes.SelectedIndex + "\desc.txt")
        Catch ex As Exception
            'Change text in "infoText" Textbox to show an error
            infoText.Text = "A desc.text file is not supplied, or an error has occured."
            'If error occurs, show in msgbox
            MsgBox(ex.ToString)
        End Try
    End Sub
It will tell me "Option Strict On disallows implict conversions from 'String' to 'Double' "
I've tried everything to my knowledge. Can any of you beautiful (lol) people help me?