You need a visa for Liberia if you have a Dutch passport
Visa options for Liberia
Electronic visa on arrival may be available for a maximum of 90 days
Travelers 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 travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVOA confirmation electronically. Travelers are recommended that they print it or show it on their mobile device. Travelers 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. Travelers must submit their application online at least 7 days but not more than 30 days before their departure. Travelers must apply for their visa directly at the embassy and not through this portal if there is a Liberian embassy in their country.
This is not offered by sherpa°.
Apply on the government site.