Too Few Observation Sequences while training new voice for MarryTTS

Question

I'm trying to build a new voice for MaryTTS in German for a while now, but didn't succeed so far. I followed a tutorial (https://github.com/marytts/marytts/wiki/HMMVoiceCreation) and tried to understand each step. No matter what I do, I get stuck at step 14 (HMMVoiceMakeVoice), the error being:

ERROR [+2121] HInit: Too Few Observation Sequences

which usually means, that the tested phone (en9 in this example) is not found within my data set.

After changing the locale, the same error happend on the phone "de27" as Nikolay Shmyrev pointed out.

I doubt that though, since I use about 500 Audio files, which have a length of at least 5 sec, so a total well over an hour of footage.

In fact, I skipped the "en9" phone, since I don't know what exactly is represented by it. The next one to fail was "oI", which I located manually about ten times in the first few audio files.

I think it has to do with the automatic labeling to not work properly (step 2-4), but I don't know, what I can do, to get a better result?

Edit: I uploaded all the files I get until this step, which can be inspected on this shared google drive. Note, that I could not, for copyright reasons, upload the wav folder. In the logs directory, you can find the logs after each step. I couldn't find any problems there, but maybe someone will.

I do not completely understand the structure of the generated data, but I thought changing the MARYBASE/mary/trickyPhones.txt and running the make tools again would be enough to change the map name from "tS" to "Z" which sounds about the same in German. But the HMMVoiceMakeVoice still results in the same output.