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Ok, my guess is that your hosting company recently upgraded your PHP. The version of xoops you are running is old and is not compatible with the version of PHP you are using.
You will need to upgrade to something ATLEAST as new as 2.3.3 of xoops. You could try 2.4.5 but the BEST version for security is the current version which is 2.5.6.
You should be able to find newer versions of your modules except system which I am unfamiliar with. You may need to do some conversions of your database tables to use the data with newer modules but you should be able to do so without much fuss.
When migrating please make sure you use a test host to ensure your data transfers properly and backup your main server before you do anything to your live server.
I believe there are newer versions of the modules you list:
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sections has been replaced by publisher
I have no clue what system is.