Error associating hub and site

Hi,

I am creating a new MS Wan.  When I try to associate the site and hub, I receive the following error:

{ "status": "Failed", "error": { "code": "ResourceDeploymentFailure", "message": "The resource operation completed with terminal provisioning state 'Failed'.", "details": [ { "code": "ConnectionOverlappingAddressSpaces", "message": "This gateway connection creates an address space overlap between two networks. The overlapping addresses are '10.1.100.0/24' and '10.1.100.0/24'.", "details": [] } ] } }

Has any one seen this?  When I try to change the overlapping IP.  It won't let me.