Problem in creating parked domain with sub-domain blog.gofurrurlong.com

Hi experts,
Through my existing domain named gofurrurlong.com, I pointed a sub-domain named blog.gofurrurlong.com to helihost of Google Hosting.
The whole process was as under in GoDaddy:
Then, with the sub-domain blog.gofurrurlong.com, I wanted to create a park domain. It shows the problem creating the parked domain. The screenshot of the problem is given below:
Subsequently, for a few days my sub-domain the sub-domain blog.gofurrurlong.com was in waiting and I think a problem has occurred there.
Please help me to solve the issue.
Thanks in advance.
