YOU SAID:

one upon a time a few mistakes ago

INTO JAPANESE

少し前の間違いがありました

BACK INTO ENGLISH

There was a mistake a little while ago.

INTO JAPANESE

少し前に間違いがありました。

BACK INTO ENGLISH

There was a mistake some time ago.

INTO JAPANESE

少し前に間違いがありました。

BACK INTO ENGLISH

There was a mistake some time ago.