Simulink Voltage-to-Frequency Converter on matlab.

Hello everyone, i read the article (i attached above) about modeling and 
implementing FPGA (Zynq -7020 ) to create VFC on it. Understanding 
analog and digital principles of that circuit, now i want to simulink it 
on Matlab use Xilinx tool and system generator.
But i have some trouble when i use matlab simulink. i dont know how to 
fix that errors. Can anyone help me? Thank you for reading.
p/s:
oneshot.vhd: file for black box in matlab.
VCO.slx:     flie matlab i use to simulink VFC.