When i edit my overlay i get an error message when clicking on alerts?

I can adjust my chat, my overlay, and facecam, i can adjust recent subs, followers, donations etc, but when i click on any alert tab it brings me to an error page.

''Something went wrong.
Please refresh your browser and try again.

You may also try clearing Overlay Expert's application cache. If you have an unsaved overlay in-progress, this will remove it.
Clear cache and reload.

If the problem persists, please see the Help Desk."

With a bunch of error codes following this message. When i test alerts in stream labs, nothing shows on my channel. How do I fix this? I wanna adjust where my alerts pop up, and i cant test them.
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