You need a visa for Liberia if you have a Spanish passport

Travellers need a visa to visit Liberia for Business or Tourism. A Liberian eVOA is the fastest and easiest way of obtaining a visa for Liberia because travellers can submit their application and supporting documents online. Once the application is approved, travellers receive their eVOA confirmation electronically. Travellers are recommended that they print it or show it on their mobile device. Travellers can obtain a visa on arrival only at Roberts International Airport (ROB) in Monrovia, which allows them to stay for a maximum of 90 days. Travellers must submit their application online at least 7 days but not more than 30 days before their departure. Travellers must apply for their visa directly at the embassy and not through this portal if there is a Liberian embassy in their country.