Error page - customiser not opening


what does is it mean to get this error in shopify when you click customiser

The theme could have errors on the code. If you test with a fresh version of Dawn do you see the same issue? If not, you should contact the theme developer.

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what could possibly be the error
i rolled back the update i had done but still error persist

The error could be any number of things - to troubleshoot you could use theme check to scan the theme files and identify where there could be a problem.