I tried parking the domain again yesterday, which worked this time. My parked domain name is now working as expected.
Whatever has changed, it worked :)
@1erik1 try attempting to park/addon the domain again.
I have been having yhr same issue for the past couple of days.
Domain name provider: Namecheap
DNS transferred to x10hosting 2 days ago.
Every time I try to add the domain as a parked domain or even as an add-on. I get the same error posted above by the OP.
Thanks for the update Skizzerz...