need to enable process model in MWS

While editing the process in MWS i am facing the error

exception.wm_bam_process_config_details] Your last action caused an exception to occur while executing getTrackingExtensionsFromWS(). The details for that exception follow SOAPException( Server: java.sql.SQLException: Connection unavailable ). The stack follows: com.webmethods.caf.wsclient.proxy.impl.WSClientDynamicProxy.java:397 com.webmethods.caf.wsclient.proxy.impl.WSClientDynamicProxy.java:216 $Proxy2.java:-1 com.webmethods.bpo.portlet.wm_bam_process_config_details.Bam_process_config_details.java:1119 com.webmethods.bpo.portlet.wm_bam_process_config_details.Bam_process_config_details.java:1004 sun.reflect.NativeMethodAccessorImpl.java:-2 sun.reflect.NativeMethodAccessorImpl.java:39 sun.reflect.DelegatingMethodAccessorImpl.java:25 java.lang.reflect.Method.java:585 com.webmethods.portal.mech.portlet.impl.PortletMechanics.java:114 com.webmethods.portal.bizPolicy.command.portlet.ExecutePortletMethod.java:53 com.webmethods.portal.framework.portlet.LegacyPortletContainer.java:229 com.webmethods.portal.framework.portlet.LegacyPortletContainer.java:110 com.webmethods.portal.framework.portlet.beans.rest.RestfulPCAHandler.java:182 com.webmethods.portal.framework.dispatch.DispatchManager.java:438 com.webmethods.portal.framework.dispatch.DispatchManager.java:371 com.webmethods.portal.framework.impl.PortalServlet.java:242 javax.servlet.http.HttpServlet.java:689 org.mortbay.jetty.servlet.ServletHolder.java:428 org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.java:830 com.webmethods.portal.framework.impl.NTLMFilter.java:50 org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.java:821 com.webmethods.caf.faces.servlet.GZIPFilter.java:34 org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.java:821 org.mortbay.jetty.servlet.WebApplicationHandler.java:471 org.mortbay.jetty.servlet.ServletHandler.java:568 org.mortbay.http.HttpContext.java:1530 org.mortbay.jetty.servlet.WebApplicationContext.java:633 org.mortbay.http.HttpContext.java:1482 com.webmethods.portal.webApplication.WmWebAppContext.java:159 org.mortbay.http.HttpServer.java:909 org.mortbay.http.HttpConnection.java:820 org.mortbay.http.HttpConnection.java:986 org.mortbay.http.HttpConnection.java:837 org.mortbay.http.SocketListener.java:245 org.mortbay.util.ThreadedServer.java:357 org.mortbay.util.ThreadPool$PoolThread.java:534

Please help me if any one faced this issue

have you a solution for this isuue?