illegal parameter number biblatex

Question

Hello I am having some issues with bibtex. Not sure what could be wrong. I used these parameters before and the citation is exported.

I am getting the following errors / warnings:

Illegal parameter number in definition of \NewValue. }
Illegal parameter number in definition of \abx@field@abstract. \endentry
Illegal parameter number in definition of \abx@field@abstract. ...raphy[heading=bibintoc,title={Literature}]
Using fall-back BibTeX(8) backend:(biblatex) functionality may be reduced/unavailable.
'firstinits' option is deprecated.
Citation 'x' on page 1 undefined
There were undefined references.
Please (re)run BibTeX on the file(s):(biblatex) doc(biblatex) and rerun LaTeX afterwards.

bibfile.bib

@Article{x,
AUTHOR = {An Author},
TITLE = {A title},
JOURNAL = {A journal},
VOLUME = {42},
YEAR = {1999},
NUMBER = {7},
ARTICLE-NUMBER = {9000},
URL = {https://www.example.com/},
ISSN = {1234-5678},
ABSTRACT = {Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.},
DOI = {12.3456/whatever}
}

doc.tex

\documentclass{article}
\usepackage[backend=bibtex,style=alphabetic,
hyperref=true,natbib=true,
backref=true,backrefstyle=three,
sortcites=true,
maxbibnames=50,
maxcitenames=3,
firstinits=true,
%   refsection=part,
%   refsegment=chapter,
isbn=false,url=true,doi=false]
{biblatex}
\usepackage{hyperref}
\bibliography{bibfile}
\begin{document}
\cite{x}
\printbibliography[heading=bibintoc,title={Literature}]
\end{document}