The value '' cannot be converted to a number.

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coldfusion.runtime.Cast$NumberConversionException: The value '' cannot be converted to a number.
	at coldfusion.runtime.Cast._double(Cast.java:883)
	at coldfusion.runtime.Cast._double(Cast.java:861)
	at coldfusion.runtime.Cast._double(Cast.java:1168)
	at coldfusion.runtime.Cast._double(Cast.java:1158)
	at cftour2ecfm297885005._factor6(C:\HostingSpaces\proc\realbigtours.com\wwwroot\tours\tour.cfm:211)
	at cftour2ecfm297885005.runPage(C:\HostingSpaces\proc\realbigtours.com\wwwroot\tours\tour.cfm:1)
	at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:251)
	at coldfusion.tagext.lang.IncludeTag.handlePageInvoke(IncludeTag.java:749)
	at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:578)
	at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:65)
	at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:613)
	at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:43)
	at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40)
	at coldfusion.filter.PathFilter.invoke(PathFilter.java:162)
	at coldfusion.filter.IpFilter.invoke(IpFilter.java:45)
	at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:97)
	at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:81)
	at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)
	at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38)
	at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:60)
	at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38)
	at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)
	at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62)
	at coldfusion.CfmServlet.service(CfmServlet.java:231)
	at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:311)
	at jdk.internal.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.apache.catalina.security.SecurityUtil.lambda$execute$0(SecurityUtil.java:222)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.base/javax.security.auth.Subject.doAsPrivileged(Subject.java:584)
	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:250)
	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:142)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:197)
	at org.apache.catalina.core.ApplicationFilterChain.lambda$doFilter$0(ApplicationFilterChain.java:128)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:127)
	at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:46)
	at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:47)
	at jdk.internal.reflect.GeneratedMethodAccessor82.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.apache.catalina.security.SecurityUtil.lambda$execute$0(SecurityUtil.java:222)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.base/javax.security.auth.Subject.doAsPrivileged(Subject.java:584)
	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:250)
	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.lambda$doFilter$0(ApplicationFilterChain.java:128)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:127)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
	at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:448)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:936)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Thread.java:833)