fix value empty issue.

build/conf/application.properties

@@ -5,6 +5,7 @@ server.port=${NACOS_APPLICATION_PORT:8848}
 server.tomcat.accesslog.max-days=30
 server.tomcat.accesslog.pattern=%h %l %u %t "%r" %s %b %D %{User-Agent}i %{Request-Source}i
 server.tomcat.accesslog.enabled=${TOMCAT_ACCESSLOG_ENABLED:false}
+server.error.include-message=ALWAYS
 # default current work dir
 server.tomcat.basedir=file:.
 #*************** Config Module Related Configurations ***************#