no add domain

adding my domain following message appears is already assigned and in use.2
Nameserver 1:
Nameserver 2:
Nameserver 3:
Nameserver 4:
Nameserver 5:
I changed the nameservers
parking area tells me that already exists on the host and used

my user is : fceu_17940784

please tell me what to do to solve this problem

Thank you!

The domain was parked somewhere else on our system so it was already in use. The domain has now been unparked from there so you can add it to your account.