Package doclicense gives error with hyperxmp; PDF is produced

Question

Compiling the following MWE:
documentclass{article}

usepackage[
    type={CC},
    modifier={by-sa},
    version={4.0},
    lang={spanish}
]{doclicense}

usepackage{lipsum,siunitx}

begin{document}
    
lipsum[1-3]
    
end{document}

When I compile I get the follwing error:
! Undefined control sequence.
<argument> hyxmp@dc@lang

However, even with the error, a PDF is produced. How does one get rid of the error? This started happening after my last TeXLive upgrade; current version is 2020.20200925-1 (running on Debian Testing); doclicense is version 2.2.1.dev.

John · Accepted Answer

The doclicence package says that it requires hyperxmp. However, your code would not run for me unless I explicitly loaded hyperxmp under v2.2.0 of doclicense. When I updated to v2.2.1 of doclicense the issue went away. (I have v5.4 of hyperxmp.)
documentclass{article}

usepackage[
    type={CC},
    modifier={by-sa},
    version={4.0},
    lang={spanish}
]{doclicense}

usepackage{lipsum,siunitx,hyperxmp} % <--- load hyperxmp with v2.2.0 of doclicense

begin{document}
    
lipsum[1-3]
    
end{document}

By loading hyperxmp explicitly, I got the output shown below with v2.2.0 of doclicense:

Package doclicense gives error with hyperxmp; PDF is produced

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