The Fresco DMX library contains a list of known DMX fixtures and how the Fresco knows how to configure them.
The library could be missing, corrupted, or possibly needing updating.
If the firmware is updated using Fresco Studio, the update process will automatically put the appropriate nLight and DMX libraries for that version of Firmware.
Manually copy the library
The library file can be manually copied to the Fresco device. Copy the available dmxlib.bin file to the Fresco drive \<fresco drive>\lib directory.