Fehlern
Fehlern is the dative plural form of the German noun Fehler, meaning errors or faults. It appears when the noun is used in contexts that require the dative case and is typically written without an article, for example after prepositions that govern the dative.
In practical use, Fehlern is most common in phrases describing or accounting for mistakes. The form often
Grammatically, Fehler is a masculine noun (der Fehler). Its plural nominative and accusative form is Fehler,
Usage notes and context: Fehlern serves to refer to multiple errors in a context requiring the dative