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Dear all, Today I tried to access on my site (http://arkham19.heliohost.org/mb/), but unfortunately I've got an error: Error report: [Home]Could not initialize class com.mysql.jdbc.Driver StackTrace: java.lang.NoClassDefFoundError: Could not initialize class com.mysql.jdbc.Driver java.lang.Class.forName0(Native Method) java.lang.Class.forName(Class.java:264) beans.ConnectionManagerBean.connect(ConnectionManagerBean.java:47) beans.ConnectionManagerBean.getCon(ConnectionManagerBean.java:66) org.apache.jsp.index_jsp._jspService(index_jsp.java:198) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:458) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:770) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:748) It 's very strange because I have not uploaded code updates and few days ago I could easily access to my site.I also tried to access the database from my local site with Eclipse and it work well. Can you give me assistance, please?Thanks in advance!