When I try to create a Hyper-V virtual machine through HC10 Panel I get an error.

My OS Template's Maximum Internal Size of vhd is 127 GB. I am trying to create a virtual machine with 10 GB vhd size.
I get the following error: No os template found with size less than provided hard drive size. 

If your OSTemplate size is 127GB then you will be able to add VM of HDD size greater than or equal to 127 GB after which the VM will be created properly.