Have anybody used FSG in sphinx3?

[chris]

I want to use FSG in sphinx3 in batch mode,but finally I got the error:
parameter list is :
-mdef /tmp/sphinx3test/share/sphinx3/model/hmm/hub4_cd_continuous_8gau_1s_c_d_dd/hub4opensrc.6000.mdef \
-fdict /tmp/sphinx3test/share/sphinx3/model/lm/an4/filler.dict \
-fsg data/eval.fsg \
-ctl data/eval.ctl \
-dict data/eval.dict \
-cepdir audio \
-mean /tmp/sphinx3test/share/sphinx3/model/hmm/hub4_cd_continuous_8gau_1s_c_d_dd/means \
-var /tmp/sphinx3test/share/sphinx3/model/hmm/hub4_cd_continuous_8gau_1s_c_d_dd/variances \
-mixw /tmp/sphinx3test/share/sphinx3/model/hmm/hub4_cd_continuous_8gau_1s_c_d_dd/mixture_weights \
-tmat /tmp/sphinx3test/share/sphinx3/model/hmm/hub4_cd_continuous_8gau_1s_c_d_dd/transition_matrices \
-maxwpf 1 \
-beam 1e-40 \
-pbeam 1e-30 \
-wbeam 1e-20 \
-maxhmmpf 1500

the last information I got is
INFO: srch.c(447): Search Initialization.
INFO: srch.c(724): lmset is NULL and vithist is NULL in op_mode OP_TST_DECODE, wrong operation mode?
FATAL_ERROR: "kb.c", line 352: Search initialization failed. Forced exit

lmset means language model?it can't use fsg?but the instruction said I can use it.anybody know about this?