Internal Server Error

Good Morning,

I am currently using the ‘Simple Catch’ theme for my blog. When I try to add my newest story to the front page carousel, I got the following message last night:

500 Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

I also get this error message when I click on the following links in my appearance menu:

-Background
-Customize
-Header
-Edit CSS

I’m also getting the following error message on my Themes page, which only shows 8 themes on the main themes page, and 15 themes on “add new.”

–An unexpected error occurred. Something may be wrong with www.ads-software.com or this server’s configuration. If you continue to have problems, please try the support forums.–

This has been happening for at least 12 hours now.

What’s going on? How can these issues be resolved in a quick matter.
I will be changing WP templates this month and doing content migration with about 4 years of posts and would like to make sure there are no internal errors happening, so this can go smoothly.

Thank You,

Jesica Ryzenberg

The page I need help with: [log in to see the link]