Go to File > Sync Project with Gradles Files.



https://stackoverflow.com/questions/47289011/how-can-i-fix-design-editor-is-unavailable-until-a-successful-build-error

https://stackoverflow.com/questions/47289011/how-can-i-fix-design-editor-is-unavailable-until-a-successful-build-error

https://stackoverflow.com/questions/47289011/how-can-i-fix-design-editor-is-unavailable-until-a-successful-build-error


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