Could not run zookeeper

When I run this command in zookeeper home, ./bin/zkServer.sh start
give an error i.e.

/usr/bin/java

ZooKeeper JMX enabled by default

Using config: /home/hadoop/zk/bin/…/conf/zoo.cfg

Starting zookeeper … FAILED TO START

can anyone has the solution?

What do you see from zookeeper logs?

Hi Umar,
Do you have this entry in your /etc/hosts file?