command succeeds, but rundeck outputs SLF4J error

[aristosv]

I have this job, where rundeck runs "init 0" on a remote linux computer to power it off. The remote computer is successfully powered off, but rundeck outputs this:

SLF4J(W): No SLF4J providers were found.
SLF4J(W): Defaulting to no-operation (NOP) logger implementation
SLF4J(W): See https://www.slf4j.org/codes.html#noProviders for further details.
SLF4J(W): Class path contains SLF4J bindings targeting slf4j-api versions 1.7.x or earlier.
SLF4J(W): Ignoring binding found at [jar:file:/home/rundeck/rundeck.war!/WEB-INF/lib/log4j-slf4j-impl-2.17.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J(W): See https://www.slf4j.org/codes.html#ignoredBindings for an explanation.

what could be the issue here?