fatal error activating Custom Google Maps add-on

I’m using the theme geodirectory in my website http://www.telemesa.es.
I bought the Custom Google Maps add-on, but When I try to activate it, it gives me this error:
Fatal error: Call to undefined function geodir_resave_settings() in /var/www/vhosts/telemesa.es/httpdocs/wp-content/plugins/geodir_custom_google_maps/geodir_custom_gmaps_functions.php on line 43

these are the geodirectory plug installed and activated in my website.
GeoDirectory
Desactivar | Editar
GeoDirectory plugin for wordpress.

Versión 1.5.9 | Por GeoDirectory | Ver detalles
There is a new version of GeoDirectory available. View version 1.6.15 details or update now.
Google Analytics BREAKING CHANGE, you must update settings at GD>General>Google Analytics: once you have updated.
Elige GeoDirectory Advance Search Filters
GeoDirectory Advance Search Filters
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GeoDirectory Advance Search Filters.

Versión 1.3.9 | Por GeoDirectory | Ver detalles
Automatic updates currently unavailable. For all Elegant Themes products, please authenticate your subscription via the Updates tab in your theme & plugin settings to enable product updates. Make sure that your Username and API Key have been entered correctly.
Elige GeoDirectory Custom Google Maps
GeoDirectory Custom Google Maps
Activar | Editar | Borrar
This plugin gives an advanced style system for Google Maps.

Versión 1.0.12 | Por GeoDirectory | Visitar la web del plugin
Elige GeoDirectory Events
GeoDirectory Events
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GeoDirectory Events plugin .

Versión 1.3.4 | Por GeoDirectory | Ver detalles
Automatic updates currently unavailable. For all Elegant Themes products, please authenticate your subscription via the Updates tab in your theme & plugin settings to enable product updates. Make sure that your Username and API Key have been entered correctly.
Elige GeoDirectory Lists
GeoDirectory Lists
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GeoDirectory Lists manager.

Versión 0.0.5 | Por GeoDirectory | Visitar la web del plugin
Elige GeoDirectory Location Manager
GeoDirectory Location Manager
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GeoDirectory Location Manager plugin.

Versión 1.4.7 | Por GeoDirectory | Ver detalles