An item referes an unexisting item factory with id 'org.ametys.web.tool.group.FOGroups'

java.lang.IllegalStateException: An item referes an unexisting item factory with id 'org.ametys.web.tool.group.FOGroups'
	at org.ametys.core.ui.RibbonConfigurationManager._lazyInitialize(RibbonConfigurationManager.java:354)
	at org.ametys.core.ui.RibbonConfigurationManager._lazyInitialize(RibbonConfigurationManager.java:317)
	at org.ametys.core.ui.RibbonConfigurationManager._lazyInitialize(RibbonConfigurationManager.java:304)
	at org.ametys.core.ui.RibbonConfigurationManager.saxRibbonDefinition(RibbonConfigurationManager.java:414)
	at org.ametys.plugins.core.ui.WorkspaceGenerator.doGenerate(WorkspaceGenerator.java:153)
	at org.ametys.web.workspace.WorkspaceGenerator.generate(WorkspaceGenerator.java:96)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:581)
	at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:301)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:782)
	at org.apache.cocoon.components.source.impl.SitemapSource.toSAX(SitemapSource.java:414)
	at org.apache.cocoon.components.source.SourceUtil.toSAX(SourceUtil.java:101)
	at org.apache.cocoon.components.source.SourceUtil.parse(SourceUtil.java:321)
	at org.apache.cocoon.sitemap.ContentAggregator.generate(ContentAggregator.java:125)