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Your requirements could not be resolved to an installable set of packages. - mpdf/mpdf v6.1.4 requires php ^5.4.0 || 7.0.* -> your PHP version (7.3.27) doesIt appears this is a locally modified copy of github.com/mpdf/mpdf - I'm not sure whether we should be patching it or just updating to a newer upstream mPDF is a PHP library which generates PDF files from UTF-8 encoded HTML. It is based on FPDF and HTML2FPDF, with a number of enhancements.