Gdddk

I have some problem with bib2gls. I followed the guideline here, https://www.dickimaw-books.com/latex/buildglossaries/#texniccenter, and here, How to effectively use List of Symbols for a thesis?. (first big answer, option 4)

But I have the problem, that the programme cannot find any corresponding .glstex file (my tex and bib files are exactly the same as in the second link for testing), so I get a lot of warnings saying files and symbols are not defined.

Error message:

Warning: No file "....glstex" on input line ...

I am a bit desperate, because I am not tech savvy and I have spent a lot of working hours to solve this already. I guess, my problem has to do with the bib2gls package: I have installed it, but I can not select any .exe file in the postprocessing part of my build procedure because the files of bib2gls are Java files. I have Java, but the first link above explicitly says that I need an .exe file for the build process :)

Do you know why the bib2gls process is not triggering? How to edit my build process properly for that?

EDIT:

documentclassreport

usepackage[colorlinks]hyperref
usepackage[symbols,
 stylemods=tree,% loads glossaries-extra-stylemods to patch styles
 record % using 'bib2gls'
]glossaries-extra

% assign titles to group labels:
glsxtrsetgrouptitlelatinLatin
glsxtrsetgrouptitlegreekGreek

GlsXtrLoadResources[
 src=latin-symbols,
 type=symbols,
 group=latin,% assign group label
 set-widest,% needed for 'alttree' styles
 save-locations=false
]

GlsXtrLoadResources[
 src=greek-symbols,
 type=symbols,
 group=greek,% assign group label
 set-widest,% needed for 'alttree' styles
 save-locations=false
]

begindocument
tableofcontents
printunsrtglossary[type=symbols,style=alttreegroup,title=List of Symbols]

chapterSample
Reference Latin symbols: $glsM$

Reference Greek symbols: $glsrho$
enddocument

The bib files do look like:

@entryM,
 name=ensuremathM,
 description=Smooth manifold

and

@entryrho,
 name=ensuremathrho,
 description=Anchor

and the first line of my log is

This is pdfTeX, Version 3.14159265-2.6-1.40.20 (MiKTeX 2.9.7000 64-bit) (preloaded format=pdflatex 2019.3.28) 28 MAR 2019 05:40