on the insert page, the file browser path was pointing to the site root instead of going into the antronix folder.
i edited the file browser path:
$CKEditor_config["filebrowserBrowseUrl"] = "../../webassist/kfm/index.php?uicolor=".urlencode(isset($CKEditor_config["uiColor"])?str_replace("#","#",$CKEditor_config["uiColor"]):"#eee")."&theme=webassist_v2";
to:
$CKEditor_config["filebrowserBrowseUrl"] = "../webassist/kfm/index.php?uicolor=".urlencode(isset($CKEditor_config["uiColor"])?str_replace("#","#",$CKEditor_config["uiColor"]):"#eee")."&theme=webassist_v2";
in order to fix the problem.