Most obvious effect of this error comes from info.magnolia.dam.imaging.ImagingBasedAssetRenderer which renders images based on variations defined in the theme (that is linked to the site). To reproduce:

• remove variations from e.g. pop-mobile
• assign pop-mobile to demo-features site
• surf demo-features and see how it falls back to default image renderer (due to not finding variations)
• surf demo-project and see how it resolve the same site (without variations)

Solution

Removing the singleton scope from definiton in the site module descriptor should resolve the problem.