If you want to visit Sweden and you are not a EU citizen, you may need to apply for a visa.
List of countries whose citizens require visas to visit Sweden
In order to apply for a visa, you need to submit your application documents in person at the Swedish Embassy in Bucharest, which can be done during the public hours of the Embassy. A decision on your application will be available after about 15 days.
If your visa application is to be considered, you must have the required documents. A number of other documents are also required, depending on what type of visit you are planning.
The forms must be completed in either Swedish or English. The documents should be in original and presented with a copy.
Information about How to apply for a visa you can find here.