Error in Potentials Settings

Hi, I edited the section "Edit Page Layout" in the "Potentials Settings" typing "Opportunità" as name of the first section (the one that's originally named as "Potential Information"). Now, the Potentials Section doesn't work very well... I think the "à" character isn't good for the section's names, but I can't edit it anymore: if I click edit I can change the name, but when I click "Save" I see an error that says "Page not found". The "Edit Page Layout" in the other sections works well.

Thank you,
Giordano.
giordano