You may need an embassy visa for Tunisia if you have a Serbian passport
Visa options for Tunisia
Visa on arrival may be available for a maximum of 90 days
Travellers need a visa to visit Tunisia for Tourism. Travellers can get a visa on arrival at Tunisia Airport if they travel under registered and organized tour groups. Travellers must present a paid voucher for hotel accommodation and a confirmed return plane ticket. Travellers who visit Tunisia individually must obtain a visitor visa. A paper or embassy visa is the only visa available for travellers visiting Tunisia. The visa is typically a stamp or sticker added to the passport. Travellers must obtain this visa from a local embassy, consulate or visa center before travelling.
This is not offered by sherpa°.
Apply on the government site.