How can I use multimeter in the sequential circuit design with Xor gate and measure power in microwatts?

I am designing a sequential circuit using XOR gate in matlab2014 but when I ran the following errors occurs:

1. Invalid setting for input port dimensions of 'AHpower/Demux'. The dimensions are being set to [-1]. This is not valid because the total number of input and output elements are not the same. Component: Simulink | Category: Block error

2. Error in port widths or dimensions. Invalid dimension has been specified for output port 1 of 'AHpower/Multimeter'. Component: Simulink | Category: Block error How can I solve these errors?

[Joel Van Sickel]

can you share your model? It probably has to do with how the multi-meter is set up and I can't tell just from the screenshot.