Sounds like you may have incorporated a fatal error into your widget definition which is causing the whole UI to fail to load. You probably need to restore one of the automatic uicomponents_ui_page.json backups in the userdata/jsondb/backup folder. If you think that will lose you too much work and you know where the error might be you can try to just edit the uicomponents_ui_page.json directly but don’t do that without reading the Editing the JSONDB, a last resort of the following post:
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