Quota error

[Info]

I encountered the below error. Is it fatel? Is there anything i can do to fix it up?   [root@ahead root]# /sbin/quotacheck -avug quotacheck: Block 3: Block 15 in tree referenced twice quotacheck: WARNING - Some data might be changed due to corruption. quotacheck: Block 3: Block 12 in tree referenced twice quotacheck: Block 3: Block 13 in tree referenced twice quotacheck: WARNING - Some data might be changed due to corruption. quotacheck: Cannot remount filesystem mounted on / read-only so counted values might not be right. Please stop all programs writing to filesystem or use -m flag to force checking.   Thanks