solo-2.9.2 换 (iMobile,mobile,Community-bubbles) 这三个主题报 500... 如下:

[ERROR]-[2018-08-11 00:21:45]- 
[org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer:138]:FreeMarker renders error
FreeMarker template error:
The following has evaluated to null or missing:
==> tocLabel  [in template "side.ftl" at line 37, column 125]
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value likemyOptionalVar!myDefault, or use <#if myOptionalVar??>whenpresent<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
    - Failed at: ${tocLabel}  [in template "side.ftl" at line 37, column 123]
    - Reached through: #include "side.ftl"  [in template "index.ftl" at line 34, column 1]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
    at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
    at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:467)
    at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:389)
    at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:358)
    at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
    at freemarker.core.Environment.visit(Environment.java:330)
    at freemarker.core.Environment.visit(Environment.java:336)
    at freemarker.core.Environment.include(Environment.java:2582)
    at freemarker.core.Include.accept(Include.java:171)
    at freemarker.core.Environment.visit(Environment.java:330)
    at freemarker.core.Environment.visit(Environment.java:336)
    at freemarker.core.Environment.process(Environment.java:309)
    at freemarker.template.Template.process(Template.java:384)
    at org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer.genHTML(AbstractFreeMarkerRenderer.java:162)
    at org.b3log.solo.processor.renderer.SkinRenderer.genHTML(SkinRenderer.java:75)
    at org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer.render(AbstractFreeMarkerRenderer.java:133)
    at org.b3log.latke.servlet.DispatcherServlet.result(DispatcherServlet.java:111)
    at org.b3log.latke.servlet.DispatcherServlet.service(DispatcherServlet.java:89)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.b3log.solo.filter.InitCheckFilter.doFilter(InitCheckFilter.java:89)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.b3log.solo.filter.PermalinkFilter.doFilter(PermalinkFilter.java:93)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.b3log.latke.servlet.filter.EncodingFilter.doFilter(EncodingFilter.java:71)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    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)

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