Thread:Support/How could I fix the following error in translations?

I was translating the Mediawiki Core into Korean. After finishing my translation, I tried to save it but could not. The error says as follows:

Your edit was not saved! Please fix following error in translations: Translation 새문서만들기 is used more than once for CreatePage and CreatePage.

Here is the link:

I could not understand what the error meant.