You need an embassy visa for Tunisia if you have a Serbian passport

Travelers need a visa to visit Tunisia for Tourism. Travelers can get a visa on arrival at Tunisia Airport if they travel under registered and organized tour groups. Travelers must present a paid voucher for hotel accommodation and a confirmed return plane ticket. Travelers who visit Tunisia individually must obtain a visitor visa. A paper or embassy visa is the only visa available for travelers visiting Tunisia. The visa is typically a stamp or sticker added to the passport. Travelers must obtain this visa from a local embassy, consulate or visa center before traveling.