I've noticed a potential error on an OpenStreetMap-based app. How can I first verify if this error is also present on the official OpenStreetMap website? If it is, what are the two main ways I can contribute to fixing this map data, according to the openstreetmap.de website?
Navigate to the 'Kontakt' (Contact) page on openstreetmap.de. Locate the section titled 'Fehler in OSM gefunden?' (Found errors in OSM?). Identify and state the recommended first step for verifying if an error is still present on the official OpenStreetMap. Identify and state the two main options provided for contributing to fixing map data if the error persists.
State that the recommended first step is to verify if the error is also visible on 'unserer Karte' (their map) on openstreetmap.de. State that the two main ways to contribute to fixing map data are 'Eine Fehlermeldung abgeben' (submitting an error report) and 'Die Daten selbst korrigieren' (correcting the data themselves).