I have the following codes:
thesis.tex
\usepackage[square, numbers, comma, sort&compress]{natbib}
\bibliographystyle{plainnat}
\bibliography{Bibliography/sample.bib}
Bibliography/sample.bib
@article{Reference1,
Author = {Alexander Schuller and Benjamin Dietz and Christoph M. Flath and Christof Weinhardt},
Journal = {IEEE Transactions on Power Systems},
Month = {September},
Number = {29},
Numpages = {9},
Pages = {2014-2022},
Title = {Charging Strategies for Battery Electric Vehicles: Economic Benchmark and V2G Potential},
Volume = {5},
Year = {2014}}
Still, TeXmaker (Mac OS) displays the standard reference list:

I tried with changing the bib file name, changing the default bibliography.bib file, and tried with creating new folders/links, but nothing worked out. There is also no other file on my drive, that contains these default references (checked by file search).
How can that be?
I would be grateful for any suggestions!
Thank you very much in advance.
Best Michael