Error codes when uploading to host service provide

Hi

I have just uploaded my completed site to my host service provider and I have the following errors displaying:

Strict Standards: Non-static method JSite::getMenu() should not be called statically, assuming $this from incompatible context in /home/ardetieh/public_html/thetenniscoach/templates/hot_tennis/index.php on line 211

Strict Standards: Non-static method JApplication::getMenu() should not be called statically, assuming $this from incompatible context in /home/ardetieh/public_html/thetenniscoach/includes/application.php on line 539

Strict Standards: Only variables should be assigned by reference in /home/ardetieh/public_html/thetenniscoach/modules/mod_hot_twitter/tmpl/default.php on line 13

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I found some information in explaining how to fix it however if I apply the change as per the below extract I get a fatal error: my site no longer displays on the web

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stackoverflow.com/questions/15922391/str...not-be-called-static

Level down error reporting level in global configuration to "System default", strict(maximum) is basicly used when you are developing something, and what you see are harmless warnings