Hi
Something is wrong with your Layer 3 design. If you host is 1010.10.2, you gateway can not be 10.0.0.9, unless you are using 255.0.0.0 as mask, which I believe you are not.
Also, the router should create two network: One segment for Ron and another for Malfoy. Then, they can´t have the same Gateway.
Try this:
On router Interface to Ron, put the IP address 10.10.10.1. Same mask as host.
On router interface to Malfoy, put ip address 192.0.0.1. Same mask as host
Then, test.
About the error on Pacektracer, I have no idea.