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Using lualatex but I encountered an error like this:

! Undefined control sequence. l.15 \DeclareRelease {v2021}{2021-01-01}{tabularray-2021.sty} ? x

\documentclass{article}
\usepackage{tabularray}
\UseTblrLibrary{booktabs}

\begin{document}

\end{document}
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  • 1
    It might be relevant in this case to indicate which version of tabularray or LaTeX you're using.
    – Miyase
    Jun 9, 2022 at 4:55
  • 1
    That probably means your LaTeX is too old.
    – Pieter van Oostrum
    Jun 9, 2022 at 5:53

1 Answer 1

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Rollback commands \DeclareRelease and \DeclareCurrentRelease were added to LaTeX kernel in release 2018-04-01 (see this TUGboat article). The error means your TeX distribution is too old.

In fact, here are the first three code lines in tabularray.sty.

\NeedsTeXFormat{LaTeX2e}[2018-04-01]
\DeclareRelease{v2021}{2021-01-01}{tabularray-2021.sty}
\DeclareCurrentRelease{}{2022-01-01}

The new rollback mechanism in LaTeX is elegant:

  • when you write \usepackage{tabularray}, you get tabularray.sty of version 2022, which requires a LaTeX release in TeX Live 2021 (MiKTeX 21) or newer;

  • when you write \usepackage{tabularray}[=v2021], you get tabularray-2021.sty of version 2021, which requires a LaTeX release in TeX Live 2020 (MiKTeX 20) or newer.

Therefore you need to update your TeX distribution to use tabularray package.

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