Cloning Using Same Default Name Stops Incrementing After Eleven Clones
Details
Why do I get an error when I use the default naming when I
create clones?
Solution
When you create multiple clones using a default name, a naming
error stops you from making any additional clones after the eleventh
clone. VirtualCenter issues an Another virtual machine with the given name already exists
error.
Give each clone a unique name. Do not rely on an automatically
incrementing numbers to assign unique names.
To correct this, upgrade to VirtualCenter 1.2 or later.