Installed modules are not visible

[Vualus]

Hi,

All basic modules, such as the Slider module, have a green "Install" button instead of edit. After clicking "Install", the error shows that the module is already installed. After I uploaded a template to my website (which I deleted in a moment due to bugs), the whole Module.php crashed to me. The error "'continue' not in the 'loop' or 'switch' context" was popping up. In this file I replaced two "continue;" to "return false;" by some instructions from the Internet, this restored the Module.php page, but appeared above mentioned error. Should I replace more "continue" with "return", or maybe do something else?

Modules work correctly on the website, I cannot only configure them from the BackOffice level. This shows the error that appears after restoring the original Module.php file:

I am sorry for different language on the screens.

Thank you in advance for your help.

Presta version 1.6