Questions & Answers about Nema nikakvog problema.
Because nema is the normal negative form of the verb imati (to have) in the 3rd person singular.
- ima = there is / it has
- nema = there is not / it does not have
In Serbian, this form is often used impersonally, so nema problema literally works like there is no problem.
Problema is genitive singular.
After nema, Serbian normally uses the genitive to express non-existence or absence:
- Ima problem. = He/She has a problem.
- Nema problema. = There is no problem / He/She has no problem.
So problem changes to problema because it follows nema.