503 Service Unavailable Back to Composer

Hi Friends! 

Can anyone help me with this error.

I'm new to this, so please show me step by step.

tomcat8-stdout.log: 

[localhost-startStop-1] ERROR com.thingworx.system.ThingWorxBootstrapper - [message: java.lang.Exception: Table [BasicSettings] does not have a field named [ScriptTimeout]]
com.thingworx.exceptions.ConfigurationException: java.lang.Exception: Table [BasicSettings] does not have a field named [ScriptTimeout]
at com.thingworx.system.configuration.PlatformSettings.getInstance(PlatformSettings.java:1875)
at com.thingworx.system.ThingWorxBootstrapper.contextInitialized(ThingWorxBootstrapper.java:74)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4689)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5155)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:743)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:719)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:970)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1840)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)