To study nonlinear minimization problem, modelled on the available model wrote a personal thing, but an error: try to access the x (2); Because numel (x)=1, the index of scope, don't know why

Firstceshi is my function and constraints, secondceshi is the sample function and constraints, and an error on my side: try to access the x (2); Because numel (x)=1, index of scope, and found a don't know where is wrong, in the evening a great god, please help,