Restored the System Settings to Default

and clicked ok

Got unexpected Error

8/18 13:40:39.949 LoggingMappingExceptionResolver.doResolveException 
java.lang.IllegalArgumentException: •Parameter 'smtpServer' can not be blank.
	at \\...\\ .\\हिñçêČάй語简�?한\\.Vꍩ᠆ᡆꎊ throw.aq(Unknown Source)
	at \\...\\ .\\हिñçêČάй語简�?한\\.j⣘ꌗ⣉ꑾ enum goto.s(Unknown Source)
	at \\...\\ .\\हिñçêČάй語简�?한\\.pᛟ0ꇒ̂ synchronized.hY(Unknown Source)
	at com.aquafold.aquadataserver.AquaDataServer.configureMailer(Unknown Source)
	at com.aquafold.aquadataserver.AquaDataServer.propertyChange(Unknown Source)
	at com.common.server.options.AbstractSystemSettingsManager.notifyChangeListeners(Unknown Source)
	at com.aquafold.aquadataserver.core.manager.SystemSettingsManagerHibernateImpl.access$200(Unknown Source)
	at com.aquafold.aquadataserver.core.manager.SystemSettingsManagerHibernateImpl$7.doInHibernate(Unknown Source)
	at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
	at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:339)
	at com.common.server.hibernate.HibernateTransactionTemplate$1.doInTransaction(Unknown Source)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
	at com.common.server.hibernate.HibernateTransactionTemplate.execute(Unknown Source)
	at com.aquafold.aquadataserver.core.manager.SystemSettingsManagerHibernateImpl.saveOrUpdateSettings(Unknown Source)
	at com.aquafold.aquadataserver.ui.controllers.admin.SystemSettingsController.saveValues(Unknown Source)
	at com.aquafold.aquadataserver.ui.controllers.admin.SystemSettingsController.edit(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:421)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:136)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:326)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:313)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:883)
	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2258)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)