JMeter Installation

How can I solve this error when running JMeter:

[root@bx1 bin]#./jmeter.sh 

java.lang.Throwable: Could not access /opt/apache-jmeter-2.6/lib/ext at org.apache.jmeter.NewDriver.(NewDriver.java:98)

java.lang.Throwable: Could not access /opt/apache-jmeter-2.6/lib/junit at org.apache.jmeter.NewDriver.(NewDriver.java:98)

java.lang.ClassNotFoundException: org.apache.jmeter.JMeter

at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:321) at java.lang.ClassLoader.loadClass(ClassLoader.java:266) at org.apache.jmeter.NewDriver.main(NewDriver.java:212)

JMeter home directory was detected as: /opt/apache-jmeter-2.6.

#jmeter