Error Message Question

["Hello ;-)" <malachai 77 gmail com>]

Hello everyone, 

I was wondering if anyone could help me out. I looked around but could not find a solution to my problem. 

Here's what I did. At work I setup the ip rang on my laptop to 10.x.x.x something. When i got home I reset my 
192.x.x.x address. 

Well i notice something was wrong in my log file. Here's the error message in my log file. 

May  9 20:57:16 localhost NetworkManager: <WARNING>      nm_system_device_set_ip4_route_with_iface (): nm_system_device_set_ip4_route_with_iface (eth0): failed to set IPv4 default route! error = File exists


Plus when when I do network restart I get this error messsage also too. 

Bringing up interface eth0:  RTNETLINK answers: Invalid argument                                                           [  OK  ]

I'm able to connect and ping outside address. so the device is working but I want to figure out why I'm getting this error message.