JoomDoc uploads fail and crash server for (some users) using current OS and current FF and IE, tested repeatedly.

Server reports to browser:
*Fatal error*: Class 'mosParameters' not found in
*/home/taacanad/public_html/administrator/components/com_joomdoc/docman.class.php*
on line *762

This code follows:
function _returnParam( $field , $config_field='',$attribs=null )
{
$docman = &DocmanFactory::getDocman();
if( ! $config_field ) { $config_field = $field ; }
if( is_null($attribs)){ $attribs = $this->attribs ;}
if( ! isset($this->_params) && $attribs )
{
$this->_params = new mosParameters( $attribs );
}
if( isset( $this->_params->$field ) )
{
return( $this->_params->$field );
}
return $docman->getCfg( $config_field );
}

This appears to be an attempt to retrieve pre-Joomla 1.5 var no longer supported. Or something else?