I figured it out. resintall the iOS and it solved the issue. to install the ios start the ipad in restore mode by following the below steps. Disconnect the USB cable from the device, but leave the other end of the cable connected to your computer's USB port. Turn off the device: Press and hold the Sleep/Wake button for a few seconds until the red slider appears, then slide the slider. Wait for the device to shut down. While pressing and holding the Home button, reconnect the USB cable to the device. The device should turn on. Continue holding the Home button until you see the Connect to iTunes screen. iTunes will alert you that it has detected a device in recovery mode. Click OK, and then restore the device.