FreeMarker template error!


Method public java.util.Collection ch.esense.magnolia.einfachkunst.models.ListArtByWorkModel.getArts(java.lang.String) throws javax.jcr.RepositoryException threw an exception when invoked on ch.esense.magnolia.einfachkunst.models.ListArtByWorkModel@79738667
The problematic instruction:
----------
==> assignment: arts=model.getArts(state.selector) [on line 8, column 1 in einfachkunst/paragraphs/listArts.ftl]
----------

Java backtrace for programmers:
----------
freemarker.template.TemplateModelException: Method public java.util.Collection ch.esense.magnolia.einfachkunst.models.ListArtByWorkModel.getArts(java.lang.String) throws javax.jcr.RepositoryException threw an exception when invoked on ch.esense.magnolia.einfachkunst.models.ListArtByWorkModel@79738667
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
	at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:93)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.Assignment.accept(Assignment.java:90)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.Environment.process(Environment.java:190)
	at freemarker.template.Template.process(Template.java:237)
	at info.magnolia.freemarker.FreemarkerHelper.render(FreemarkerHelper.java:148)
	at info.magnolia.module.templating.paragraphs.FreemarkerParagraphRenderer.onRender(FreemarkerParagraphRenderer.java:92)
	at info.magnolia.module.templating.AbstractRenderer.render(AbstractRenderer.java:94)
	at info.magnolia.module.templating.paragraphs.AbstractParagraphRenderer.render(AbstractParagraphRenderer.java:65)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine$RenderingHelper$1.render(DefaultRenderingEngine.java:80)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:171)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:127)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:120)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine$$EnhancerByCGLIB$$34205e92.render(<generated>)
	at info.magnolia.cms.taglibs.Include.doEndTag(Include.java:215)
	at freemarker.ext.jsp.TagTransformModel$TagWriter.endEvaluation(TagTransformModel.java:430)
	at freemarker.ext.jsp.TagTransformModel$TagWriter.afterBody(TagTransformModel.java:406)
	at freemarker.core.Environment.visit(Environment.java:301)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.Environment.visit(Environment.java:299)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.Environment.process(Environment.java:190)
	at freemarker.template.Template.process(Template.java:237)
	at info.magnolia.freemarker.FreemarkerHelper.render(FreemarkerHelper.java:148)
	at info.magnolia.module.templating.renderers.FreemarkerTemplateRenderer.onRender(FreemarkerTemplateRenderer.java:75)
	at info.magnolia.module.templating.AbstractRenderer.render(AbstractRenderer.java:94)
	at info.magnolia.module.templating.renderers.AbstractTemplateRenderer.renderTemplate(AbstractTemplateRenderer.java:77)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine$RenderingHelper$2.render(DefaultRenderingEngine.java:108)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:171)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:130)
	at info.magnolia.module.templating.engine.DefaultRenderingEngine$$EnhancerByCGLIB$$34205e92.render(<generated>)
	at info.magnolia.module.templating.RenderingFilter.render(RenderingFilter.java:137)
	at info.magnolia.module.templating.RenderingFilter.doFilter(RenderingFilter.java:92)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.BackwardCompatibilityFilter.doFilter(BackwardCompatibilityFilter.java:73)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.module.templating.ModelExecutionFilter.doFilter(ModelExecutionFilter.java:88)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.InterceptFilter.doFilter(InterceptFilter.java:121)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.AggregatorFilter.doFilter(AggregatorFilter.java:104)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.RepositoryMappingFilter.doFilter(RepositoryMappingFilter.java:91)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:76)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:69)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:57)
	at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:147)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:75)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:88)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:77)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
	at info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:86)
	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:120)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
	at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:105)
	at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:216)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:244)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
	at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:283)
	at org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProtocol.java:189)
	at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:1648)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
Caused by: javax.jcr.PathNotFoundException: artist/104/104004
	at org.apache.jackrabbit.core.NodeImpl.getNode(NodeImpl.java:2706)
	at info.magnolia.cms.core.DefaultContent.<init>(DefaultContent.java:120)
	at info.magnolia.cms.core.DefaultHierarchyManager.getContent(DefaultHierarchyManager.java:236)
	at ch.esense.magnolia.einfachkunst.models.ListArtByWorkModel.getArts(ListArtByWorkModel.java:26)
	at sun.reflect.GeneratedMethodAccessor139.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:840)
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
	... 127 more