500 Internal Server Error

java.lang.IllegalStateException: Could not borrow serving image view from pool
	at com.adconion.ads.context.AbstractRequestContext.getServingImageView(AbstractRequestContext.java:646)
	at com.adconion.ads.context.CreativeDaoImpl.getClickUrl(CreativeDaoImpl.java:258)
	at com.adconion.ads.web.ClickServlet.parseHrefClick(ClickServlet.java:440)
	at com.adconion.ads.web.ClickServlet.parseServerSpecificRequestParameters(ClickServlet.java:197)
	at com.adconion.ads.web.ClickServlet.parseServerSpecificRequestParameters(ClickServlet.java:73)
	at com.adconion.ads.web.AbstractEventServlet.parseRequest(AbstractEventServlet.java:748)
	at com.adconion.ads.web.AbstractEventServlet.handleRequestInternal(AbstractEventServlet.java:1341)
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:146)
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: No active serving image
	at com.adconion.system.si.ServingImageViewPoolFactory.makeObject(ServingImageViewPoolFactory.java:87)
	at com.adconion.system.si.ServingImageViewPoolFactory.makeObject(ServingImageViewPoolFactory.java:33)
	at com.adconion.system.si.ServingImageViewPool.borrowObject(ServingImageViewPool.java:91)
	at com.adconion.system.si.ServingImageViewPool.borrowObject(ServingImageViewPool.java:31)
	at com.adconion.ads.context.AbstractRequestContext.getServingImageView(AbstractRequestContext.java:644)
	... 37 more