Can you paste output for one of the connected client as asked before, also based on your response to Scott seems like this is a new issue which happened just today, are you aware of anything that changed recently?
@Nadia Bbz wrote:
wireless client : can't ping neither the gateway of vlan wirelss nor le WLC or any other ip address
Well, if the wireless client is disconnected from the WLAN, why would it be able to ping any IP address when it doesn't have an IP address?
Create an SSID with open authentication. Make sure the SSID is using the same dynamic interface. See if this problem occurs with an open SSID.