Here is my assignment:

Your circuit in Part$-2$ must accept a $4-$bit $2\text{'}$s complement input $\{$in$3,$ in$2,$ in$1,$ in$0\}$ where in$3$ is the most significant bit and in$0$ is the least significant bit. The outputs of your circuit must illuminate the two $7-$segment displays such that they display the decimal value of the input. Since this a $4-$bit $2$s complement represented number, that means the range of numbers $(24=16)$ that can be shown correctly on the hex display $($with sign$)$ is $[-24-1,+24-1-1]=[-8,+7].$

I've attached what I have so far and I am getting an error. Please help me fix my circuit design and include how many bits each component should be$.$ I am using Digital to design my circuits.