training with vosk problem

Hello, I am trying to perform a training of a Vosk model. I ran the code in https://github.com/alphacep/vosk-api/blob/master/python/example/colab/vosk-training.ipynb and after several attempts I was able to run a training for a number of epochs and get the output model. I got a folder containing several files but I noticed that, compared to the pre-defined models, the two files HCLr.fst and Gr.fst are missing. I then tried to run the code https://github.com/alphacep/vosk-api/blob/master/python/example/colab/vosk-adaptation.ipynb initially trying to reproduce the vosk-model-small-en-us-0.15-compile-colab.tar.gz with the data obtained from the previous training but the compile-graph.sh show these errors:
Later I tried the code with the default folder but also in this case there are problems with converting HCLG.fst to HCLr.fst and to Gr.fst, can anyone help me to solve these problems?