Flume-ng is not working for me

When I tried the below command,
flume-ng agent --name a1 --conf-file /home/robji_100/flume_demo/example.conf

flume is not starting, as can be seen from the log snippet,

tive::/usr/hdp/ org.apache.flume.node.Application --name a1 --conf-file /home/robji_100/flume_demo/example.conf
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/hdp/!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/hdp/!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console. Set system property ‘log4j2.debug’ to show Log4j2 internal initialization logging.

No indication of source, sink started.

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