download language model issue

[ghost]

Hello guys.
I tried to use language model for inference.
I've successfully built custom tensorflow (https://nvidia.github.io/OpenSeq2Seq/html/installation.html#how-to-build-a-custom-native-tf-op-for-ctc-decoder-with-language-model-optional).
But after it, when I try to run
./scripts/download_lm.sh,
it gives

Reading 4-gram-lower.arpa
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Identifying n-grams omitted by SRI
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Quantizing
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Writing trie
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SUCCESS
INFO: Skipping trie generation, since no custom TF op based CTC decoder found.
INFO: Please use Baidu CTC decoder with this language model.

How can I build language model?