! Undefined control sequence. \documentclass

[elysia-best]

This is Asiatic pTeX, Version 3.141592653 (preloaded format=ptex-ng)
entering extended mode
(main.tex
! Undefined control sequence.
l.6 \documentclass
                  [11pt]{report}

Will ptex-ng support this？

[clerkma]

platex-ng main.tex or ptex-ng -format=platex-ng main.tex