ReferenceError: /var/www/probaan/views/500.ejs:8
   6| <body>
   7| <div>There is an error <%=url%></div>
>> 8| <div>Stack<%=(stack ? stack : '')%></div>
   9| </body>
   10| </html>

stack is not defined
   at eval (eval at compile (/var/www/probaan/node_modules/ejs/lib/ejs.js:618:12), <anonymous>:14:26)
   at returnedFn (/var/www/probaan/node_modules/ejs/lib/ejs.js:653:17)
   at tryHandleCache (/var/www/probaan/node_modules/ejs/lib/ejs.js:251:36)
   at View.exports.renderFile [as engine] (/var/www/probaan/node_modules/ejs/lib/ejs.js:482:10)
   at View.render (/var/www/probaan/node_modules/express/lib/view.js:135:8)
   at tryRender (/var/www/probaan/node_modules/express/lib/application.js:640:10)
   at Function.render (/var/www/probaan/node_modules/express/lib/application.js:592:3)
   at ServerResponse.render (/var/www/probaan/node_modules/express/lib/response.js:1008:7)
   at ServerResponse.res.render (/var/www/probaan/node_modules/express-ejs-layouts/lib/express-layouts.js:77:18)
   at Object.html (/var/www/probaan/modules/middlewares/helperMiddlewares.js:37:21)
   at ServerResponse.res.format (/var/www/probaan/node_modules/express/lib/response.js:671:13)
   at unexptectedError (/var/www/probaan/modules/middlewares/helperMiddlewares.js:30:13)
   at newFn (/var/www/probaan/node_modules/express-async-errors/index.js:16:20)
   at Layer.handle_error (/var/www/probaan/node_modules/express/lib/router/layer.js:71:5)
   at trim_prefix (/var/www/probaan/node_modules/express/lib/router/index.js:315:13)
   at /var/www/probaan/node_modules/express/lib/router/index.js:284:7
   at Function.process_params (/var/www/probaan/node_modules/express/lib/router/index.js:335:12)
   at next (/var/www/probaan/node_modules/express/lib/router/index.js:275:10)
   at /var/www/probaan/node_modules/express/lib/router/index.js:635:15
   at next (/var/www/probaan/node_modules/express/lib/router/index.js:260:14)
   at next (/var/www/probaan/node_modules/express/lib/router/route.js:127:14)
   at /var/www/probaan/node_modules/express-async-errors/index.js:18:44