Cable stayed bridge analysis

Hello sir/mam,

I am post graduate student in structural engineering.

I am doing my mini project . And analysing a cable stayed bridge. But having some difficulties and constant errors.

please help me resolve this issue.

Errors are 

1. WARNING:Section fails while designing section: 0.0 mm Exceeds maximum. permissible tensile steel %

2.WARNING:Section fails while detailing  No bar is available for reinforcement

3WARNING:Section fails while designing section: 0.0 mm
Nominal shear force exceeds tauc_max limit

I am attaching my std file along with it. Suggest me the necessary changes.

3324.STD