Error while uploading gedcom and edit

Hi,

I created a tree with a gedcom file ; the tree is created but without anything from my gedcom file.

When i click on the EDIT button, error 500

In the apache log :
[Thu Feb 18 15:22:01.068744 2016] [:error] [pid 59631] [client 213.163.174.6:1124] PHP Fatal error: Using $this when not in object context in /var/www/html/joomla/components/com_simgenealogy/libraries/php-gedcom/library/PhpGedcom/Parser/Obje.php on line 59, referer: http://joomla.szerma[...]=tree&tid=8


How to solve this ?

Thanks