RosAria ArRobot::myPacketReader: Timed out

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i am working with Pioneer 3DX and using RosAria library to control the robot. The rosaria library was working fine. But suddenly today I encountered this problem and I am not able to solve. On running rosaria rode using 'rosrun rosaria RosAria' I face the following serial error. I have set full permissions for my serial port.

ramkumar@ramkumar-Inspiron-7720:~$ rosrun rosaria RosAria rosrun rosaria RosAria _port:=/dev/ttyUSB0
[ INFO] [1422207128.792943336]: RosAria: using port: [/dev/ttyUSB0]
Could not connect to simulator, connecting to robot through serial port /dev/ttyUSB0.
Syncing 0
Syncing 1
Syncing 2
Connected to robot.
Name: IIT-madras_3906
Type: Pioneer
Subtype: p3dx-sh
ArConfig: Config version: 2.0
Loaded robot parameters from p3dx-sh.p
ArRobotPacketReceiver::receivePacket: bad packet, bad checksum
ArRobotConnector: Connecting to MTX batteries (if neccesary)...
ArRobotConnector: Connecting to MTX sonar (if neccesary)...
[ INFO] [1422207129.572967595]: Setting TicksMM from ROS Parameter: 128
[ INFO] [1422207129.575718946]: Setting DriftFactor from ROS Parameter: 0
[ INFO] [1422207129.577907662]: Setting RevCount from ROS Parameter: 16570
ArRobot::myPacketReader: Timed out (4) at 1002 (200 into cycle after sleeping 200)
[ INFO] [1422207129.817593371]: RosAria: publishing new recharge state 0.
[ INFO] [1422207129.817769667]: RosAria: publishing new motors state 0.
ArRobot::myPacketReader: Timed out (4) at 1203 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 1404 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 1604 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 1804 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 2004 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 2205 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 2405 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 2605 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 2805 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 3006 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 3206 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 3406 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 3606 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 3807 (201 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 4007 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 4207 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 4407 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 4607 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 4808 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 5008 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 5208 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 5408 (200 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 5609 (201 into cycle after sleeping 200)
ArRobot::myPacketReader: Timed out (4) at 5809 (200 ...