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I tried to compile latex 2 time after bibtex compilation. My references are in bib file and I am using jabref.

\documentclass[conference]{IEEEtran}
\IEEEoverridecommandlockouts
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{algorithmic}
\usepackage{graphicx}
\usepackage{textcomp}
\usepackage[backend = bibtex, sorting=none]{biblatex}
\usepackage{xcolor}
\def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
    T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}


\addbibresource{facial expression recognition.bib}
\begin{document}

\title{}

\cite{Ekman1971}


\maketitle

%\begin{abstract}
%This document is a model and instructions for \LaTeX.
%This and the IEEEtran.cls file define the components of your paper [title, text, heads, etc.]. *CRITICAL: Do Not Use Symbols, Special Characters, Footnotes, 
%or Math in Paper Title or Abstract.
%\end{abstract}

%\begin{IEEEkeywords}
%component, formatting, style, styling, insert
%\end{IEEEkeywords}

\section{Introduction}



\printbibliography
\end{document}

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Phelype Oleinik
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Alamzaib Farooq
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    don't use spaces in files names (like in your bib file). If this doesn't solve the problem show the content of the blg-file. – Ulrike Fischer Jun 20 '19 at 19:41
  • @UlrikeFischer I changed. No effect. – Alamzaib Farooq Jun 20 '19 at 19:43
  • The do what I said in my second sentence. – Ulrike Fischer Jun 20 '19 at 19:44
  • @UlrikeFischer "This is BibTeX, Version 0.99dThe top-level auxiliary file: Facial Expression Recognition.aux The style file: biblatex.bst White space in argument---line 3 of file Facial Expression Recognition.aux : \bibdata{Facial_Expression_Recognition-blx,facial : expression recognition} I'm skipping whatever remains of this command Database file #1: Facial_Expression_Recognition-blx.bib Warning--I didn't find a database entry for "Ekman1971" Biblatex version: 3.8 (There was 1 error message)" – Alamzaib Farooq Jun 20 '19 at 19:46
  • well obviously there are still some spaces in file names around, as one can see in Facial Expression Recognition.aux – Ulrike Fischer Jun 20 '19 at 19:48
  • The .blg file still complains about a file name with spaces in it (Facial Expression Recognition). Make sure that no file name involved has spaces in it (your .bib file and your .tex file) and that you have renamed all instances of the file correctly. Then remove the temporary files (.aux, .bbl, .bcf, -blx.bib) and try again. – moewe Jun 20 '19 at 19:49
  • @UlrikeFischer Oh thank you so much. Yes, I removed spaces in all other files. Now It's okay!!!! Now there is only one warning left "Package biblatex Warning: Using fall-back BibTeX(8) backend: (biblatex) functionality may be reduced/unavailable." Can you tell me about it? – Alamzaib Farooq Jun 20 '19 at 19:53
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    well you are using backend = bibtex,, and bibtex is much less powerfull than biber. If you want to switch: remove this text and setup your editor to call biber instead of bibtex. see https://tex.stackexchange.com/questions/154751/biblatex-with-biber-configuring-my-editor-to-avoid-undefined-citations – Ulrike Fischer Jun 20 '19 at 19:55

1 Answers1

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I was getting warning because I had white spaces in my other files. I removed white spaces and now it's all working.

Alamzaib Farooq
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