Rosaria P3-DX does not syn

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Hello,

I'm trying to use a P3-DX pionner, I installed ROSARIA. When I try to use rosrun the robot does not syn.

 
 
[ INFO] [1439822848.983522504]: RosAria: using port: [/dev/ttyUSB0]
Could not connect to simulator, connecting to robot through serial port /dev/ttyUSB0.
Syncing 0
No packet.
Syncing 0
No packet.
Trying to close possible old connection
Syncing 0
No packet.
Syncing 0
No packet.
 Robot may be connected but not open, trying to dislodge.
Syncing 0
No packet.
 Robot may be connected but not open, trying to dislodge.
Syncing 0
No packet.
Could not connect, no robot responding.
Failed to connect to robot.
[ERROR] [1439822855.737404764]: RosAria: ARIA could not connect to robot! (Check ~port parameter is correct, and permissions on port device.)
[FATAL] [1439822855.737519583]: RosAria: ROS node setup failed...
 
I've been checking several answers but so far no improvements. Any ideas on how to make this syn?
 
It's probably a port problem I don't understand  how this PORT thing works. I used the command sudo chmod a+rw /dev/ttyUSB0 and after this rosrun rosaria RosAria _port:=/dev/ttyUSB0.
 
Thx so much.