I was able to fix this by moving to a different container setup process. I'm
in the process of determining what exactly the problem turned out to be.
alkamin wrote
I have Geoserver running in an ubuntu docker container.
Everything works perfectly (that I've noticed) other than the CSS
Extension. No matter what version of Geoserver and the corresponding css
plugin, I'm getting the same error when I click the 'CSS Styles' link in
the navigation list. I've tried 2.7.6 to 2.8.3 without success. I have a
suspicion that it may be something related to how I am setting up the
container. I'm definitely at a loss on what to try next. Here is the error
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