The frame ID is made out of the characters capital A-Z and 0-9. Identifiers beginning with "X", "Y" and "Z" are for experimental frames and free for everyone to use, without the need to set the experimental bit in the tag header. Bear in mind that someone else might have used the same identifier as you. All other identifiers are either used or reserved for future use.
So 1. it must not have a space there and 2. it must begin with X, Y, or Z if it is different from the standard set of frame IDs.
Oh well, I tracked it down, all better. Will upload sometime soon (more fixes to make).