Rome invented sola ecclesia when she made herself alone the supreme authority on doctrine.
Christ established His Church and gave it authority guided by the Holy Spirit, the pillar and foundation of truth.
If we disagree on this, which is likely, it is a different topic than whether the doctrine of sola scriptura is unworkable, unscriptural and unhistoric.
That topic has been dealt with, but that Rome operates under sola ecclesia is the reality, and that is also does not produce universal unity.