SpringBoot Springboot use logback, but log file show: version_IS_UNDEFINED

My springboot version is 2.3.x, logback version is 1.2.3. But when i search log detail in production env, the file show some logs: 11/02/2021 09:23:16 ERROR version_IS_UNDEFINED [http-nio-8685-exec-2]c.c.l.c.d.w.p.WorkOrderReAssignParam...

As you see, i cant not konw how to resolve 'version_IS_UNDEFINED', Need i set and declare a param named 'version' in my logback-spring.xml?

Comment From: huchuansai

Declare a param like this can resolve the problem, because i use a param like '${version}' in my loback-spring.xml, but i do not declare a param named 'version'.....