debian 12.4 pixmap problem

    Hi All,
    I have a machine running debian with gnome installed. My problem is that when I enter 'Applications / System tools / Preferences and select font setting or look and feel etc, I get a notice 'Failed to open file'/usr/share/pixmaps//lock.png. When I click OK on the notice it is replaced with another 'Failed to open notice with a different pixmap number. This happens about 4 times until all notices are cleared. These are also present when I first boot up the machine.
    Any ideas as I am new to linux. Just using this machine to mess around with and get some knowledge of linux.


    Thanks in advance.

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