Emergency Please Help?

I install a domain and creat a new forest after it I install 2 other DC’s
in the same forest domain.After it I creat a new forest and connect these
2 forests after working I remove all links of forests and try to uninstall
ADS from first DC but it show a error message:

Failed to Determine.

If domain microsoft.com is a leaf domain.
“The wizard can not remove ADS from this DC because other child or
tree domain linked with it.