Cvx_status='unbounded' , cvx_slvtol=1.4901e-08

unbounded
How could I solve this problem? Modify my model or change parameter value?
And, I also have the problem with cvx_status --‘Infeasible’ ,‘Failed’.

Read these.

Everything except for section 1 of the first link also applies to CVX.

Thank you for your help! I read it now.