Some java classes reference non-existing "unknown content-type" images (SearchGenerator, GlobalContentConsistencyGenerator and WorkflowTasksComponent):
org.ametys.cms.repository.SearchGenerator
ContentType contentType = _contentTypeExtensionPoint.getExtension(content.getType()); attrs.addCDATAAttribute("smallIcon", contentType != null ? contentType.getSmallIcon() : "/plugins/cms/resources/img/contenttype/unknown_16.png"); attrs.addCDATAAttribute("mediumIcon", contentType != null ? contentType.getMediumIcon() : "/plugins/cms/resources/img/contenttype/unknown_32.png"); attrs.addCDATAAttribute("largeIcon", contentType != null ? contentType.getLargeIcon() : "/plugins/cms/resources/img/contenttype/unknown_48.png");
The contenttype/unknown_xx.png files do not exist, they should be replaced by unknown-small, unknown-medium and unknown-large.png files.