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java.lang.IllegalArgumentException: There must be at least one validator	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)	at org.sonatype.nexus.plugins.capabilities.internal.validator.ConjunctionValidator.(ConjunctionValidator.java:45)	at org.sonatype.nexus.plugins.capabilities.support.validator.LogicalValidators.and(LogicalValidators.java:47)	at org.sonatype.nexus.plugins.capabilities.internal.validator.DescriptorConstraintsValidator.(DescriptorConstraintsValidator.java:76)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:86)	at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:108)	at com.google.inject.internal.ConstructorInjector.access$000(ConstructorInjector.java:32)	at com.google.inject.internal.ConstructorInjector$1.call(ConstructorInjector.java:91)	at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:100)	at org.sonatype.guice.plexus.lifecycles.PlexusLifecycleManager.onProvision(PlexusLifecycleManager.java:138)	at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:108)	at com.google.inject.internal.ProvisionListenerStackCallback.provision(ProvisionListenerStackCallback.java:55)	at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:89)	at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:259)	at com.google.inject.internal.InjectorImpl$3$1.call(InjectorImpl.java:965)	at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1011)	at com.google.inject.internal.InjectorImpl$3.get(InjectorImpl.java:961)	at com.google.inject.assistedinject.FactoryProvider2.invoke(FactoryProvider2.java:632)	at undefined.$Proxy42.constraintsOf(Unknown Source)	at org.sonatype.nexus.plugins.capabilities.support.validator.CapabilityValidators.constraintsOf(CapabilityValidators.java:126)	at org.sonatype.nexus.plugins.capabilities.internal.DefaultValidatorRegistry.get(DefaultValidatorRegistry.java:107)	at org.sonatype.nexus.plugins.capabilities.internal.config.DefaultCapabilityConfiguration.update(DefaultCapabilityConfiguration.java:194)	at org.sonatype.nexus.plugins.capabilities.internal.rest.CapabilityPlexusResource.put(CapabilityPlexusResource.java:152)	at org.sonatype.plexus.rest.resource.RestletResource.storeRepresentation(RestletResource.java:327)	at org.sonatype.nexus.rest.NexusRestletResource.storeRepresentation(NexusRestletResource.java:95)	at org.restlet.resource.Resource.put(Resource.java:706)	at org.restlet.resource.Resource.handlePut(Resource.java:603)	at org.restlet.Finder.handle(Finder.java:359)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.sonatype.plexus.rest.RetargetableRestlet.doHandle(RetargetableRestlet.java:39)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at com.noelios.restlet.StatusFilter.doHandle(StatusFilter.java:130)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at com.noelios.restlet.ChainHelper.handle(ChainHelper.java:124)	at com.noelios.restlet.application.ApplicationHelper.handle(ApplicationHelper.java:112)	at org.restlet.Application.handle(Application.java:341)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at com.noelios.restlet.ChainHelper.handle(ChainHelper.java:124)	at org.restlet.Component.handle(Component.java:673)	at org.restlet.Server.handle(Server.java:331)	at com.noelios.restlet.ServerHelper.handle(ServerHelper.java:68)	at com.noelios.restlet.http.HttpServerHelper.handle(HttpServerHelper.java:147)	at com.noelios.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:881)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:547)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1359)	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:74)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)	at org.eclipse.jetty.server.Server.handle(Server.java:345)	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)	at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:936)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:801)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:224)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)	at java.lang.Thread.run(Thread.java:680)