Two errors / warnings when activating this plugin

I get these errors / warnings when I activate this plugin:

Strict Standards: Non-static method GFCPTAddon::get_base_path() should not be called statically in /sites/indicia/i4c-connect/prototype/wp-content/plugins/gravity-forms-custom-post-types/gfcptaddon.php on line 55

Strict Standards: Non-static method GFCPTAddon::get_base_path() should not be called statically in /sites/indicia/i4c-connect/prototype/wp-content/plugins/gravity-forms-custom-post-types/gfcptaddon.php on line 58

https://wordpress.org/plugins/gravity-forms-custom-post-types/