HELLO DEAR SIR I WANT TO GET ORIGNAL INVITATION...

 To obtain an official invitation for a Serbian visa, follow these steps:
Contact a Host in Serbia:
If you have friends, family, or business partners in Serbia, ask them to provide an official invitation letter.
The invitation should include details such as your purpose of visit, duration of stay, and their contact information.
Business Invitation:
If you’re visiting for business purposes, request an invitation from a Serbian company or organization.
The company should provide an official letter on their letterhead, specifying the purpose of your visit, dates, and any relevant business meetings or events.
Tourist Invitation:
If you’re traveling as a tourist, you can request an invitation from a travel agency in Serbia.
The agency will issue a voucher or payment receipt as proof of your trip.
Submit Your Visa Application:
Visit the Serbian embassy or consulate in your country.
Submit your visa application along with the invitation letter and other required documents (passport, photo, completed application form).