Thread:Support/Error when using 'Extended MediaWiki translation'

When trying to update the lb-translations for the module 'Special alias pages' I get the error-message: 'Please fix following error in translations:

Translation Zoufälleg_Säit_aus_der_Kategorie is used more than once for RandomInCategory and RandomInCategory.'

Unfortunately I do not understand this error message. Who can provide more information on this?

Many thanks for your help.