pandoc-citeproc error 83 with Rmarkdown file
<p>I have the following document, that I am trying to compile with Rstudio:</p>

<pre><code>---
title:
shorttitle:
author: 

bibliography:
  - library.bib

output: papaja::apa6_pdf
---

```{r message = FALSE, warning = FALSE}
library("papaja")
apa_prepare_doc() # Prepare document for rendering
```
# Introduction

@Bakan1966

# References
```{r create_r-references}
r_refs(file = "r-references.bib")
```
</code></pre>

<p>When I run knit, it compiles the .md file, but pandoc gives an error:</p>

<pre><code>pandoc-citeproc: "stdin" (line 232, column 2):
unexpected "a"
expecting "c", "C", "p", "P", "s" or "S"
pandoc: Error running filter /Applications/RStudio.app/Contents/MacOS/pandoc/pandoc-citeproc
Error: pandoc document conversion failed with error 83
In addition: Warning messages:
1: In yaml::yaml.load(enc2utf8(string), ...) :
  NAs introduced by coercion: 1,2,3 is not an integer
2: In yaml::yaml.load(enc2utf8(string), ...) :
  NAs introduced by coercion: 1,2,3 is not an integer
Execution halted
</code></pre>

<p>I have found similar problems on different topics around but none of the proposed solutions worked for me...</p>