how to solve a problem with being unable to open an interface?

All of the sudden one of my interfaces refuses to open and throws an error (see image). I was able to update the interface yesterday with no problems. Weirdly enough the latest version I can open is form 2 weeks ago. It seems to work fine on the site but throws an error on the designer. I also noticed that the evaluation ID changes every time I open it, if that matters. Has anyone run into this problem and found a solution?

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