Why I can´t edit it? It always throw me that error so I can access to add Script Editor. Regards
The unexpected error is an ambiguous error, But what I think you are using the
New experiences for lists and the Form Web Parts is only available in the
So try to do the following:
- Go to site content > open your list.
- Go to list Setting > Advanced Setting.
- Scroll down to List experience.
- If the
New Experienceis checked so you will not be able to use Form Web Parts So Check Classic Experience to can open your forms in edit mode.