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This issue has not been resolved, can somebody help me please? Thanks in advance!

Stefan Kottwitz wrote:Perhaps you have to run bibtex (or biber) again on the document, and then compile the .tex again.

Stefan

What do you mean by 'run bibtex again'? I'm compiling my .tex file in Overleaf, with the corresponding .bib file in the same folder.

Dear all,
My citations are not recognized anymore when I compile my .tex file. My bibliography file is called encapsulation.bib and I'm referring to my bibliography using:
\bibliography{encapsulation}
In the main text I cite using (for example for a reference called "li") :
\cite{li}
What could be ...

For a research paper, I'm using the achemso package, but I keep getting the following error:

\end{mcitethebibliography}

The relevant part of my .tex file is:

\documentclass[journal=jacsat,manuscript=article]{achemso}
\usepackage{chemformula}
\usepackage[T1]{fontenc}
\title{Surface xxx ...