You may also lose the right to appeal the decision.
The Immigration Act 2004 groups countries into three different categories (schedules) according to their visa requirements.
If your country is not listed in one of these schedules, you must apply for a visa before you travel to Ireland Note: A Schengen visa or UK D visa is not valid for travel to Ireland. A holder of a diplomatic passport issued by a State or territorial entity specified below is not required to have a visa to enter Ireland If you’re a citizen of one of these countries and you meet Visa Waiver Programme requirements, you may be able to travel on to Ireland from the UK without the need to obtain a separate Irish visa.
It is not sufficient to send in copies of your documents.
All documentation submitted must be original and verifiable (e.g.) employment/study details, accommodation bookings must have correct contact details on each document.