bedwarsrel error

16.05 05:05:00 [Server] INFO Enabling BedwarsRel v1.3.4
16.05 05:05:00 [Server] WARN SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
16.05 05:05:00 [Server] WARN SLF4J: Defaulting to no-operation (NOP) logger implementation
16.05 05:05:00 [Server] WARN SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.