Tell us what you are trying to do? I would like to have users edit their account. This worked up till now, the last three users get this error mentioned in the title.
Is there any documentation that you are following? The site exist already for some years and as said it always worked.
What is the link to your site? hidden link For login: hidden link
I checked on the issue for you and the problem seems to be that the roll that you want to edit wasn't selected.
I've tested this and selected the role of the user I created and it works fine. So i would suggest selecting all the roles that you would want the form to edit.
This is actually done on the edit page for the form itself. If you go to Toolset -> User Forms and then select your edit form, you can click the additional roles that you want the form to apply for.