Error in Room Template Creation

hi,

In portal we developed our own room template.Due to some reasons we have deleted that room template also.After deletion the room template name is not appearing in the dropdown when I try to create a room.

But when we tried to create another room template with the same room template name which I have deleted earlier, it is giving an error 'No valid name for room template'. what is the reason.........

Is the deleted room template existing anywhere?

Thanks and regards.

shami.