草稿箱报 500 错误！ 我写了 2 小时的博客啊！

写了 2 小时的博客，点了下保存草稿箱 然后就没了 T-T 有人遇见过这问题吗, 草稿箱能看到那篇文章，但是点进去就是 500

[ERROR]-[2020-01-11 10:48:56]-[org.b3log.latke.http.renderer.AbstractFreeMarkerRenderer:107]: Renders template [error/404.ftl] failed [Request [
    method=GET,
    URI=/articles/2020/01/10/1578670203670.html,
    contentType=null,
        remoteAddr=/220.184.165.233:56719,
    headers=[
        Host=www.growingdev.com:8080
        Connection=keep-alive
        Upgrade-Insecure-Requests=1
        User-Agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36
        Accept=text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
        Referer=http://www.growingdev.com:8080/admin-index.do
        Accept-Encoding=gzip, deflate
        Accept-Language=zh-CN,zh;q=0.9,en;q=0.8
        Cookie=visited=%5B%22%2F%22%5D; mobile-skin=Casper; skin=Casper; LATKE_SESSION_ID=YmaCFt1IcnIU3pGi; solo=c605efd83b1803f51fb63c8d00526a6adc82ffc6c8640527aab8ec1215dcc3f43bd5dbbc70781817feeb0bce1ace0cd29a4b9bdca58862523bf9c809dfe5e368
        content-length=0
    ]
]]
java.lang.NullPointerException
        at org.b3log.latke.http.renderer.AbstractFreeMarkerRenderer.genHTML(AbstractFreeMarkerRenderer.java:130)
        at org.b3log.solo.processor.SkinRenderer.genHTML(SkinRenderer.java:86)
        at org.b3log.latke.http.renderer.AbstractFreeMarkerRenderer.render(AbstractFreeMarkerRenderer.java:101)
        at org.b3log.latke.http.Response.sendError(Response.java:136)
        at org.b3log.latke.http.RequestContext.sendError(RequestContext.java:289)
        at org.b3log.solo.processor.PermalinkHandler.handle(PermalinkHandler.java:113)
        at org.b3log.latke.http.RequestContext.handle(RequestContext.java:550)
        at org.b3log.solo.processor.InitCheckHandler.handle(InitCheckHandler.java:65)
        at org.b3log.latke.http.RequestContext.handle(RequestContext.java:550)
        at org.b3log.solo.processor.SkinHandler.handle(SkinHandler.java:64)
        at org.b3log.latke.http.RequestContext.handle(RequestContext.java:550)
        at org.b3log.latke.http.handler.StaticResourceHandler.handle(StaticResourceHandler.java:40)
        at org.b3log.latke.http.RequestContext.handle(RequestContext.java:550)
        at org.b3log.latke.http.Dispatcher.handle(Dispatcher.java:96)
        at org.b3log.latke.http.ServerHandler.channelRead0(ServerHandler.java:83)
        at org.b3log.latke.http.ServerHandler.channelRead0(ServerHandler.java:37)
        at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
        at org.b3log.latke.http.WebSocketHandler.handleHttpRequest(WebSocketHandler.java:94)
        at org.b3log.latke.http.WebSocketHandler.channelRead0(WebSocketHandler.java:51)
        at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
        at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438)
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:326)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:300)
        at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514)
        at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.lang.Thread.run(Thread.java:748)