Cannot access website. Unexpected Errors

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Hello All, I'm experiencing an issue with our website and receiving the following error:

Declaration of Concrete\Core\Permission\Access\EditPagePropertiesPageAccess::save($args) should be compatible with Concrete\Core\Permission\Access\Access::save()

AND

Declaration of Concrete\Core\Multilingual\Page\Section\Section::getByID($cID, $cvID = 'RECENT') should be compatible with Concrete\Core\Page\Page::getByID($cID, $version = 'RECENT', $class = 'Page')

The issue started today, as it was working fine yesterday. Below is some additional information.

Website:http://www.childrenscentre.ca/
Concrete5 version: 5.7.5.9 (I can't check but I'm pretty sure it's this)
PHP Version: 5.6.30
MySQL Version: 5.6.35
Hosting: HostPapa

If any other information would be helpful or required please let me know. Hoping to sort this out, we haven't received an issue like this before and not sure how to resolve it.