yacs 10.1.15, pour tests

sur une installe en local avec xampp, j'ai les warnings php suivant :

Strict Standards: Non-static method Safe::header() should not be called statically in /opt/lampp/htdocs/latest/shared/safe.php on line 1185

Strict Standards: Non-static method Safe::load() should not be called statically in /opt/lampp/htdocs/latest/shared/global.php on line 269

Strict Standards: Non-static method Safe::realpath() should not be called statically in /opt/lampp/htdocs/latest/shared/safe.php on line 669

Strict Standards: Non-static method Safe::error_reporting() should not be called statically in /opt/lampp/htdocs/latest/shared/global.php on line 279