org.osgi.service.blueprint.container.ComponentDefinitionException: Unable to validate xml

org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The
matching wildcard is strict, but no declaration can be found for element
'p:externalAttachment'.	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(UnknownSource)	at org.apache.xerces.util.ErrorHandlerWrapper.error(UnknownSource)	at org.apache.xerces.impl.XMLErrorReporter.reportError(UnknownSource)	at org.apache.xerces.impl.XMLErrorReporter.reportError(UnknownSource)	at org.apache.xerces.impl.XMLErrorReporter.reportError(UnknownSource)	at org.apache.xerces.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(UnknownSource)	at org.apache.xerces.impl.xs.XMLSchemaValidator.reportSchemaError(UnknownSource)	at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(UnknownSource)	at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(UnknownSource)	at org.apache.xerces.jaxp.validation.DOMValidatorHelper.beginNode(UnknownSource)	at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(UnknownSource)	at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(UnknownSource)	at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(UnknownSource)	at javax.xml.validation.Validator.validate(Unknown Source)	at org.apache.aries.blueprint.parser.Parser.validate(Parser.java:285)	at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:313)	at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:261)	at org.apache.aries.blueprint.container.BlueprintExtender.createContainer(BlueprintExtender.java:259)	at org.apache.aries.blueprint.container.BlueprintExtender.modifiedBundle(BlueprintExtender.java:222)	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.customizerModified(BundleHookBundleTracker.java:500)	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.customizerModified(BundleHookBundleTracker.java:433)	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$AbstractTracked.track(BundleHookBundleTracker.java:725)	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.bundleChanged(BundleHookBundleTracker.java:463)	at org.apache.aries.util.tracker.hook.BundleHookBundleTracker$BundleEventHook.event(BundleHookBundleTracker.java:422)	at org.eclipse.osgi.framework.internal.core.Framework$10.call(Framework.java:1606)	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.notifyHookPrivileged(ServiceRegistry.java:1239)	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.notifyHooksPrivileged(ServiceRegistry.java:1222)	at org.eclipse.osgi.framework.internal.core.Framework.notifyEventHooksPrivileged(Framework.java:1603)	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEventPrivileged(Framework.java:1558)	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEvent(Framework.java:1505)	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEvent(Framework.java:1500)	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:391)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:300)	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.resumeBundles(PackageAdminImpl.java:312)	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.processDelta(PackageAdminImpl.java:556)	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.doResolveBundles(PackageAdminImpl.java:251)	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl$1.run(PackageAdminImpl.java:174)	at java.lang.Thread.run(Thread.java:724)