Generate Trie Issue

./generate_trie ~/GermanSpeechToText/DeepSpeech/data/alphabet.txt ~/GermanSpeechToText/GermanAudioData/lm2.binary ~/
ERROR: VectorFst::Write: Write failed:

I keep on getting this error i am totaly stuck for 3 days please help me out

This has already been answered at https://github.com/mozilla/DeepSpeech/issues/2016