title: org.thymeleaf.exceptions.TemplateProcessingException
body: <pre><code>org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#request.userPrincipal.name" (template: "/_header" - line 10, col 46)
      at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:290) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE]
      at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
      at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
      at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
      at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
  </code></pre>
  
  <p>when I run <a href="https://localhost:8080" rel="nofollow noreferrer">https://localhost:8080</a>
  Im getting above error in console</p>