Unable to enable Security & Encryption after upgrading to Confluence 7.x

Summary

After upgrading to Confluence 7.x and updating Security & Encryption, the app can not be enabled and the following error appears in the logs:
2019-11-04 11:56:18,656 ERROR [ThreadPoolAsyncTaskExecutor::Thread 76] [extender.internal.support.ExtenderConfiguration] onOsgiApplicationEvent Application context refresh failed (NonValidatingOsgiBundleXmlApplicationContext(bundle=net.customware.confluence.plugin.vault.security-and-encryption, config=osgibundle:/META-INF/spring/*.xml))
– referer: http://servicerocket.com:8090/plugins/servlet/upm | url: /rest/plugins/1.0/net.customware.confluence.plugin.vault-key | traceId: f947975ac496d4fe | userName: ABC
org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from URL [bundle://311.0:0/META-INF/spring/context.xml]; nested exception is java.lang.IllegalStateException: The bundle is uninstalled.
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:419)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:224)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:195)
at org.eclipse.gemini.blueprint.context.support.OsgiBundleXmlApplicationContext.loadBeanDefinitions(OsgiBundleXmlApplicationContext.java:171)
at org.eclipse.gemini.blueprint.context.support.OsgiBundleXmlApplicationContext.loadBeanDefinitions(OsgiBundleXmlApplicationContext.java:141)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:133)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:636)
at org.eclipse.gemini.blueprint.context.support.AbstractDelegatedExecutionApplicationContext.access$800(AbstractDelegatedExecutionApplicationContext.java:57)
at org.eclipse.gemini.blueprint.context.support.AbstractDelegatedExecutionApplicationContext$3.run(AbstractDelegatedExecutionApplicationContext.java:239)
at org.eclipse.gemini.blueprint.util.internal.PrivilegedUtils.executeWithCustomTCCL(PrivilegedUtils.java:85)
at org.eclipse.gemini.blueprint.context.support.AbstractDelegatedExecutionApplicationContext.startRefresh(AbstractDelegatedExecutionApplicationContext.java:217)
at org.eclipse.gemini.blueprint.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor.stageOne(DependencyWaiterApplicationContextExecutor.java:224)
at org.eclipse.gemini.blueprint.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor.refresh(DependencyWaiterApplicationContextExecutor.java:177)
at org.eclipse.gemini.blueprint.context.support.AbstractDelegatedExecutionApplicationContext.refresh(AbstractDelegatedExecutionApplicationContext.java:154)
at org.eclipse.gemini.blueprint.extender.internal.activator.LifecycleManager$1.run(LifecycleManager.java:213)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: The bundle is uninstalled.
at org.apache.felix.framework.Felix.getBundleResources(Felix.java:1706)
at org.apache.felix.framework.BundleImpl.getResources(BundleImpl.java:689)
at org.eclipse.gemini.blueprint.util.BundleDelegatingClassLoader.getResources(BundleDelegatingClassLoader.java:186)
at org.springframework.core.io.support.PropertiesLoaderUtils.loadAllProperties(PropertiesLoaderUtils.java:178)
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.getHandlerMappings(DefaultNamespaceHandlerResolver.java:164)
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.resolve(DefaultNamespaceHandlerResolver.java:118)
at org.eclipse.gemini.blueprint.extender.internal.support.NamespacePlugins$Plugin.resolve(NamespacePlugins.java:77)
at org.eclipse.gemini.blueprint.extender.internal.support.NamespacePlugins$5.operate(NamespacePlugins.java:209)
at org.eclipse.gemini.blueprint.extender.internal.support.NamespacePlugins$5.operate(NamespacePlugins.java:205)
at org.eclipse.gemini.blueprint.extender.internal.support.LazyBundleRegistry.apply(LazyBundleRegistry.java:159)
at org.eclipse.gemini.blueprint.extender.internal.support.NamespacePlugins.doResolve(NamespacePlugins.java:205)
at org.eclipse.gemini.blueprint.extender.internal.support.NamespacePlugins.resolve(NamespacePlugins.java:169)
at sun.reflect.GeneratedMethodAccessor107.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.gemini.blueprint.context.support.TrackingUtil$OsgiServiceHandler.invoke(TrackingUtil.java:106)
at com.sun.proxy.$Proxy597.resolve(Unknown Source)
at org.eclipse.gemini.blueprint.context.support.DelegatedNamespaceHandlerResolver.resolve(DelegatedNamespaceHandlerResolver.java:55)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1361)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1352)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:179)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:149)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:96)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:513)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:393)
... 20 more
Environment

Confluence 7.x
Cause

This issue is caused by the old app data being present in the cache.
Workaround

stop Confluence
Clear plugins cache in Confluence
restart Confluence