template project not work on fresh 7.8.3

i’ve a production enviroment upgraded to 7.8.3 and when i try to work with template project no add task project in module with gannt.
So i install a new fresh 7.8.3 to find the problem but do the same thing!

apache log error:
[Mon May 08 21:10:59.900065 2017] [:error] [pid 1154] [client 192.168.1.57:59031] PHP Notice: Undefined index: task_id in /var/www/seicrm/modules/AM_ProjectTemplates/controller.php on line 230, referer: http://seitest.crm/index.php?module=AM_ProjectTemplates&offset=1&stamp=1494268429016898600&return_module=AM_ProjectTemplates&action=view_GanttChart&record=f35ef41b-edf2-9c26-9339-5910b934d9bf

[Mon May 08 21:10:59.900861 2017] [:error] [pid 1154] [client 192.168.1.57:59031] PHP Fatal error: Call to a member function format() on boolean in /var/www/seicrm/modules/AM_ProjectTemplates/controller.php on line 252, referer: http://seitest.crm/index.php?module=AM_ProjectTemplates&offset=1&stamp=1494268429016898600&return_module=AM_ProjectTemplates&action=view_GanttChart&record=f35ef41b-edf2-9c26-9339-5910b934d9bf

have you any idea where is the problem?

PHP 5.6.30-0+deb8u1 (cli) (built: Feb 8 2017 08:50:21)
mysql Ver 14.14 Distrib 5.5.55, for debian-linux-gnu (x86_64) using readline 6.3

thanks