Error at startup./mkgraph_lookahead.sh

[retr0-iv]

During the deployment process, kaldi reached the point of use utils/mkgraph_lookahead.sh . Returns an error:

utils/mkgraph_lookahead.sh : compiling grammar data/ru-mix.lm.gz tree-info exp/tdnn/tree tree-info exp/tdnn/tree 
fstdeterminizestar 
data/lang/L_disambig.fst fstcomposecontext --context-size=2 --central-position=1 --read-disambig-syms=data/lang/phones/disambig.int --write-disambig-syms=exp/tdnn/lgraph/disambig_ilabels_2_1.int exp/tdnn/lgraph/ilabels_2_1.3718 exp/tdnn/lgraph/L_disambig_det.fst make-h-transducer --disambig-syms-out=exp/tdnn/lgraph/disambig_tid.int --transition-scale=1.0 exp/tdnn/lgraph/ilabels_2_1 exp/tdnn/tree exp/tdnn/final.mdl add-self-loops --disambig-syms=exp/tdnn/lgraph/disambig_tid.int --self-loop-scale=1.0 --reorder=true exp/tdnn/final.mdl 
fstdeterminizestar 
apply_map.pl: warning! missing key 0 in exp/tdnn/lgraph/relabel 
apply_map.pl: warning! missing key 250012 in exp/tdnn/lgraph/relabel ERROR: SymbolTable::Read: Read failed: standard input 
ERROR: SymbolTable::Read: Read failed: standard input 
ERROR: VectorFst::Read: Unexpected end of file: standard input 
ERROR: FstHeader::Read: Bad FST header: standard input. Magic number not matched. Got: 0 

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Before this step, everything worked correctly and was installed without errors. What could be wrong? how to solve this problem?