Ah, well. The default config doesn't contain information for the laser ID because it was reflecting Tekkit configs. Tekkit uses Buildcraft 2 which doesn't contain a laser, however Technic uses Buildcraft 3 which does. The lasers block ID was auto-generated by your machine on first launch, the issue went unnoticed until now* because yours is the first machine dumb enough to pick an in use block ID.
*Until now being the 6 hours that the test build has been live.