FreeMarker template error:
?substring(...) argument #2 had invalid value: The index mustn't be greater than the length of the string, 0, but it was 1.

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FTL stack trace ("~" means nesting-related):
	- Failed at: ${engineer.name?substring(0, 1)}  [in template "order/appraiseEngineer.ftl" at line 11, column 23]
	- Reached through: @html title="工程师评价 - \${engineer.name...  [in template "order/appraiseEngineer.ftl" at line 11, column 1]
----

Java stack trace (for programmers):
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freemarker.core._TemplateModelException: [... Exception message was already printed; see it above ...]
	at freemarker.core.MessageUtil.newMethodArgInvalidValueException(MessageUtil.java:262)
	at freemarker.core.BuiltInsForStringsBasic$substringBI$1.newIndexGreaterThanLengthException(BuiltInsForStringsBasic.java:498)
	at freemarker.core.BuiltInsForStringsBasic$substringBI$1.exec(BuiltInsForStringsBasic.java:481)
	at freemarker.core.MethodCall._eval(MethodCall.java:62)
	at freemarker.core.Expression.eval(Expression.java:76)
	at freemarker.core.Expression.evalAndCoerceToString(Expression.java:80)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:40)
	at freemarker.core.Environment.visit(Environment.java:257)
	at freemarker.core.MixedContent.accept(MixedContent.java:57)
	at freemarker.core.Environment.visit(Environment.java:257)
	at freemarker.core.Environment.renderElementToString(Environment.java:2053)
	at freemarker.core.StringLiteral.evalAndCoerceToString(StringLiteral.java:80)
	at freemarker.core.StringLiteral._eval(StringLiteral.java:57)
	at freemarker.core.Expression.eval(Expression.java:76)
	at freemarker.core.Environment.visit(Environment.java:638)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:80)
	at freemarker.core.Environment.visit(Environment.java:257)
	at freemarker.core.MixedContent.accept(MixedContent.java:57)
	at freemarker.core.Environment.visit(Environment.java:257)
	at freemarker.core.Environment.process(Environment.java:235)
	at freemarker.template.Template.process(Template.java:262)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:367)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:284)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:234)
	at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
	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:620)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at com.tmg.commons.filter.ExceptionFilter.doFilter(ExceptionFilter.java:30)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at com.tmg.jikexiu.common.filter.SettingFilter.doFilter(SettingFilter.java:33)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at com.tmg.commons.filter.OrderSourceFilter.doFilter(OrderSourceFilter.java:86)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$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)