Sher Afghan

AoA Everyone, I need some guidance in modal Analysis. I am assigned to modal a structure in zone 2B region. After successful modelling, My first 30 modes is neither translation nor torsional. I have go through the model to find the error but it is all correct and according to the architecture plan. Can someone guide me. What should I do to make the first three modes as translation and torsional mode. My structure has 4 floors including 2 basements.