Signal Dimension Error WITHIN Default Simulink Cross Product Block

I am repeatedly recieving errors from the Simulink Cross Product block. Both inputs are [3 x 1], yet I receive the following errors:

Error in port widths or dimensions. Output port 1 of 'Project/Subsystem1/Subsystem2/Subsystem3/Cross Product/Demux2' is a [3x1] matrix.

Component:Simulink | Category:Model error

Error in port widths or dimensions. Input port 1 of 'Project/Subsystem1/Subsystem2/Subsystem3/Cross Product/Add3' is a one dimensional vector with 1 elements.

Component:Simulink | Category:Model error

File path names changed for anonimity, otherwise exact copy & paste of error reports received in Diagnostic Viewer.

Here is a picture of the internal structure of the cross product block producing the error, with signal dimensions visible:

Does anyone have any intuition as to what might be the source of the problem?

Answer 1

[Fangjun Jiang]

I ssume you didn't make any change to the "Add" block. Don't specify the size or dimension of your downstream signal (where the Outport "y" is connected to).

Make a simple example, connect two constant blocks with rand(3,1) as the value to the Cross Product block to see if it has error.