Hey Joshua, I will be here to guide you. First of all, I have cheked the website you attached and looks like the website is alright. However, the error you are getting because PHP is trying to print some string where it's actually an object.
Here are the steps you can follow to identify the source of the issue.
Step 1: Login to your admin area and turn on "Debug" mode from the global configuration.
Step 2: Visit the url where you are getting the error. Now, you will be able to see the which file is throwing the error.
Step 3: If you still can't see the source, rename the error.php file from your template temporarily and see if you can itentify the source.
Step 4: Most likely some addon which are either custom or override from your templates are causing the error. You need to fix the code to get the site work again.
However, if you can't fix that then share the error details here. I will guide you futher.
Regards