Problems icon font manager

Hi,
i would like to upload my own icons, like in really my OWN icons.
what i did: created my icon in illustrator, exported it in .svg format, made a .zip folder and then tried to upload it.

there was aready a thread about that here, but it was closed….(the one with the manually update via ftp)

i got the following error:

Couldn’t add the font.
The script returned the following error:
Fatal error: Call to a member function attributes() on a non-object in /homepages/29/d516571436/htdocs/test/wordpress/wp-content/themes/enfold/enfold/config-templatebuilder/avia-template-builder/php/font-manager.class.php on line 192

please help!

thx!