how to delete group instance in GCP

When I am going to delete the group instance it always failed. The notification is that, but the problem is that I can not find the 'projects/windowtrafic/global/backendServices/backend' in google console.

The notification message:

The instance_group_manager resource 'projects/windowtrafic/regions/asia-east1/instanceGroupManagers/instance-group-cchatty' is already being used by 'projects/windowtrafic/global/backendServices/backend'

Solution 1:

Try to delete the Load Balancer that is using the groups instance.

Very important thing when you delete the LB don't forget to delete service backend, you can do that by checking the box during the LB deleting.