A corrected model is attached below.
The diagnostic points to nodes that have no inertia associated with them.
If you add inertia blocks, that will enable it to run.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/341173/image.png)
You will get diagnostics saying that initial velocity targets are being ignored. You can set the targets to "None" to make those diagnostics go away.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/341176/image.png)