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What causes the error "Had IO Exception with stylesheet file: ... unknown protocol: daisyskin (or wikidata)"?

When developing custom XSLT files, you might come accross the following error:

Unable to get transformer handler for daisyskin:/(default)document-styling/html/XYZ.xsl
Exception when creating Transformer from daisyskin:/(default)document-styling/html/XYZ.xsl
Had IO Exception with stylesheet file: daisyskin:xslt/some-file.xsl
unknown protocol: daisyskin

This error most likely means that there is an xsl:import or xsl:include in the XYZ.xsl, which refers to a file (daisyskin:xslt/some-file.xsl) that doesn't exist.