joomla 3.1.5 SJ template and YT framework

joomla 3.1.5 SJ template and YT framework

while using joomla 3.15 with sj template with YT framework. I am getting
below errors
Strict Standards: Only variables should be passed by reference in
C:\xampp\htdocs\global\plugins\system\yt\includes\libs\yt-minify.php on
line 120
Strict Standards: Non-static method JSite::getMenu() should not be called
statically, assuming $this from incompatible context in
C:\xampp\htdocs\global\plugins\system\yt\includes\site\lib\yt_template.php
on line 107
Strict Standards: Non-static method JApplication::getMenu() should not be
called statically, assuming $this from incompatible context in
C:\xampp\htdocs\global\includes\application.php on line 593
Strict Standards: Non-static method JSite::getMenu() should not be called
statically, assuming $this from incompatible context in
C:\xampp\htdocs\global\plugins\system\yt\includes\site\lib\yt_template.php
on line 107
Strict Standards: Non-static method JApplication::getMenu() should not be
called statically, assuming $this from incompatible context in
C:\xampp\htdocs\global\includes\application.php on line 593
And also installed YT framework still i am getting this errors Kindly help
me..