System ID: /home/jostein/pipeline-modules/scripts-utils/html-utils/src/test/xspec/html-to-fileset.xspec
Main validation file: /home/jostein/pipeline-modules/scripts-utils/html-utils/src/test/xspec/html-to-fileset.xspec
Schema: /home/jostein/Oxygen XML Editor 14/frameworks/xspec/schema/xspec.rnc
Engine name: Jing
Severity: error
Description: element "x:variable" not allowed here; expected element "x:import", "x:param", "x:pending" or "x:scenario"
Start location: 6:6
End location: 6:16

Doesn't look like you reference doc-base anywhere anyway so maybe just remove it?