Vehicle data acquisition simulation using Vehicle Network Toolbox in Simulink

I have created a sensor data acquisition model on simulink using Vehicle network toolbox blocks. I have used a used defined function block for converting the int8 data coming form SARADC block into an unsigned 8 bit vector such that I can feed the same to CAN PACK block for transmssion. The matlab code used in user-defined function block for conversion is attached. The same error showed up when I put a Bus to vector converter in the path between user defined function block and CAN pack block.

The error shown was-

Inferred size ('[1 8]') for data 'y' does not match back propagated size ('scalar') from Simulink.

Simulink cannot determine sizes and/or types of the outputs for block 'ADC_CANmodel/MATLAB Function' due to errors in the block body, or limitations of the underlying analysis. The errors might be inaccurate. Fix the indicated errors, or explicitly specify sizes and/or types for all block outputs.

Another thing I tried was putting an integrated matlab function block between ADC and CAN pack block, giving the same converter function to it and setting output dimension of block to be 8 and MATLAB function as converter function file name.

This showed an error-

Invalid input signal width, data type or input port is not connected. The data type of input signal must be UINT8 with a maximum signal width of 8.

An error occurred while propagating data type 'double' from 'ADC_CANmodel/Interpreted MATLAB Function', output port 1.

Please help me where am I going wrong. Please help as soon as possible.