Hi , i see the following PHP error messages/sentences in my website (http://www.flightofeagle.com).. I am using concrete5 for last 4 years and never had any issue. Please let me know how to fix this problem and remove these error messages. I do not do any coding or any complex stuff in site. i just post word articles.

Strict Standards: Non-static method Cache::get() should not be called statically in /home2/flightof/public_html/concrete/models/package.php on line 78

Strict Standards: Non-static method Cache::key() should not be called statically in /home2/flightof/public_html/concrete/libraries/cache.php on line 116

Strict Standards: Non-static method Cache::getLibrary() should not be called statically in /home2/flightof/public_html/concrete/libraries/cache.php on line 120

Strict Standards: Non-static method Cache::key() should not be called statically in /home2/flightof/public_html/concrete/libraries/cache.php on line 13