Grails Runtime Exception

Error ${request.'javax.servlet.error.status_code'}: ${request.'javax.servlet.error.message'.encodeAsHTML()}
Servlet: ${request.'javax.servlet.error.servlet_name'}
URI: ${request.'javax.servlet.error.request_uri'}
Exception Message: ${exception.message?.encodeAsHTML()}
Caused by: ${exception.cause?.message?.encodeAsHTML()}
Class: ${exception.className}
At Line: [${exception.lineNumber}]
Code Snippet:

${cs?.encodeAsHTML()}

${it.encodeAsHTML()}