et ego dico tibi quia tu es Petrus et super hanc petram aedificabo ecclesiam meam et portae inferi non praevalebunt adversum eam
Which translates to:
I tell you that you are Peter and on this rock I will build my church (ecclesiam) and the gates of hell would not prevail against it;
From an on-line Latin Dictionary, the definition of ecclesia is:
noun
Definitions:
So, I'm not seeing your issue, as the Vulgate translation is from the late 4th century.
Of Course the “ church” mistranslates the word Ekklisia” It mean “ the called out”. The translation is bogus in the vulgate.