Our Appian 7.11 demo system was running fine till yesterday. We tried resta

Our Appian 7.11 demo system was running fine till yesterday.
We tried restarting the system today and got the following error.
Looking for help on how to resolve this.
Attaching the JBOSS log file as well.

11:15:24,397 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/suite]] (ServerService Thread Pool -- 79) JBWEB000287: Exception sending context initialized event to listener instance of class com.appiancorp.plugins.PluginLoader: com.atlassian.plugin.osgi.container.OsgiContainerException: Unable to clean the cache directory: D:\\Appy711Trng\\ear\\suite.ear\\web.war\\WEB-INF\\osgi-cache\\felix
          at com.atlassian.plugin.osgi.container.impl.DefaultOsgiPersistentCache.validate(DefaultOsgiPersistentCache.java:91) [atlassian-plugins-osgi-2.12.3-appian-1.1.jar:]
          at com.atlassian.plugin.osgi.container.impl.DefaultOsgiPersistentCache.<init>(DefaultOsgiPersistentCache.java:37) [atlassian-plugins-osgi-2.12.3-appian-1.1.jar:]
          ...

server.log

OriginalPostID-199836

OriginalPostID-199836