Previewer isn't working

Whenever I open my previewer and try to use it, it just stays blank then when I tick track script on it I get a error 11

There is an error in your script but it doesn’t tell you where it is, to unfreeze your previewer
Box you have to reload the website. I’m not good at pin pointing where the error, but from what I’ve seen with this error it’s usually because you can’t have a transition in 0

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thank you, but error 11 has now turned into Error: Assertion failed: undefined