It looks like you have some configuration items linked to customer groups and that is preventing you from deleting the group. If you query cf_config_item_group you will see the GUIDs for the groups that have configuration items associated to them.
Those relationships will need to be removed before you can proceed with the group deletion. Safest/recommended way is to use the Administration component in Console and remove the items from the relevant group you wish to delete.
Hope that helps.
how can i delete one record from TABLE tps_user