Please help us help you and fill where relevant:
LimeSurvey version: LimeSurvey Community Edition Versione 6.16.11+260303
Own server or LimeSurvey Cloud: own server
Survey theme/template: Fruity
==================Good morning,Issue:
Error 500 when opening Account → PersonalSettingsError message:
Internal server error 500 – 3 arguments are required, 2 givenConditions:

• user selects it-informal on the login page
• user account created with it-informal as default language and the language is left unchanged on the login page

Steps to reproduce:

1. Log in with a user configured with it-informal
2. Open Account → PersonalSettings

Expected result:
PersonalSettings page opens normally.Actual result:
Internal server error 500 – 3 arguments are required, 2 given.Screenshot of the debug page attached.Best regards