plugin upload error message wpthumb

  • Hi,
    I am seeing this error message when I install a new plugin to my site by UPLOADING IT.

    Everything seems to be working fine and the error message doesn’t appear if I install a plugin via the dashboard without having to upload it.

    The only thing I can thing off is that I changed media file sizes when first setting up this WordPress install. Could this be related ?

    Does anyone know what this means and how to fix it please ?

    The error message:

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘wpthumb_delete_cache_for_file’ not found or invalid function name in /home/ehawebde/public_html/e-ha.co.uk/spc/wp-includes/plugin.php on line 235

    Thanks in advance

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