Same error occurred with 3D Classics Urban Champion and similar (just black screen) error with 3D Classics - Xevious. In all three cases home menu still working. Other "3D classics" titles (kirby, kid icarus, excitebike) works fine.
(New 3DS XL, fw: 11.15.0, luma: 10.2.1, fbi: 2.6.1)