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I am fairly new to Latex. I have googled that and saw 300 different responses and not really helped me.

My text was compiling previously with no major issues but now all my bibliography references are appearing like the label in the bib file.

I deleted the aux file due to one of the posts I saw, maybe that's the reason.

This is how it appears: "...specially in coastal zones (guannel16)."

My file header looks like that:

\documentclass[12pt, letterpaper]{article}
\usepackage[a4paper,left=2.54cm,right=2.54cm,top=1.25cm,bottom=1.5cm] 
{geometry}
\usepackage[utf8]{inputenc}%codification of the document
\usepackage[english]{babel}
\usepackage{blindtext}
\usepackage{pdfpages}
\usepackage{graphicx}
\usepackage{multirow}
\usepackage{tabularx}
\usepackage[section]{placeins}

\usepackage[autocite=inline, maxbibnames=20, citestyle=authoryear,                         
bibstyle=authoryear, backend=biber, natbib]{biblatex}
\renewcommand*{\nameyeardelim}{\addcomma\space}
\renewcommand{\thesection}{\Alph{section}}

\addbibresource{referenceRP.bib}

And the output is all citation (...) undefined.

closed as off-topic by moewe, Stefan Pinnow, Phelype Oleinik, TeXnician, Bobyandbob Apr 3 '18 at 12:12

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If this question can be reworded to fit the rules in the help center, please edit the question.

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    You need to run biber: tex.stackexchange.com/questions/154751/… – Johannes_B Mar 27 '18 at 4:56
  • If running Biber does not help, we need to see the log file that Biber produces. Please add the contents of the .blg file to your question (Windows classifies .blg files as "Performance Manitor Files", but the .blgs produced by Biber are just plain text files you can open with your favourite editor). – moewe Mar 27 '18 at 5:17
  • I can't find the .blg file, where is it? Running biber didn't help – Nery Neto Mar 27 '18 at 6:39
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    It's working with biber now. That link you sent me to update biber wasn't working properly. I had to upload MikTex and then upload biber. Then I got another error message, but it just took me to delete the aux file. Thank you for your help! – Nery Neto Apr 3 '18 at 4:09
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    I'm voting to close this question as off-topic because it was about a version conflict with biblatex and Biber that has finally been resolved. – moewe Apr 3 '18 at 10:21