Failed to initialize tesseract engine. but i have a tessdata about tesseract

[msfmar]

I have a similar issue. At first the example project (https://github.com/charlesw/tesseract-samples) ran fine, but after adding german language training data to the ./tessdata folder and using that instead of the english one (by replacing the "eng" in line 18 with "deu") , I get the following error (ConsoleDemo) :

Error opening data file ./tessdata/deu.traineddata
Please make sure the TESSDATA_PREFIX environment variable is set to your "tessdata" directory.
Failed loading language 'deu'
Tesseract couldn't load any languages!
Unexpected Error: Failed to initialise tesseract engine.. See https://github.com/charlesw/tesseract/wiki/Error-1 for details.
Details:
Tesseract.TesseractException: Failed to initialise tesseract engine.. See https://github.com/charlesw/tesseract/wiki/Error-1 for details.
at Tesseract.TesseractEngine.Initialise(String datapath, String language, EngineMode engineMode, IEnumerable`1 configFiles, IDictionary`2 initialValues, Boolean setOnlyNonDebugVariables)
at Tesseract.TesseractEngine..ctor(String datapath, String language, EngineMode engineMode, IEnumerable`1 configFiles, IDictionary`2 initialOptions, Boolean setOnlyNonDebugVariables)
at Tesseract.TesseractEngine..ctor(String datapath, String language, EngineMode engineMode)
at Tesseract.ConsoleDemo.Program.Main(String[] args) in [ReposPath]\tesseract-samples\src\Tesseract.ConsoleDemo\Program.cs:line 19

I downloaded the Language form the linked repository, where it also says it was made for Tesseract 4 so there should not be any version issues.

Edit: found the issue, I did not set the german language file to copy on build (in VS right klick --> properties). Leaving this comment in cas any one else runs into the same issue.