java.lang.NoClassDefFoundError: org/apache/commons/collections/FastHashMap$KeySet

What does this error means?
su_harvieAsked:
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dttriConnect With a Mentor Commented:
Please check your CLASSPATH environment variable and import the neccessary package.
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su_harvieAuthor Commented:
how to solve it?
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YagantappaCommented:
Add "commons-collections.jar" file to your classpath.
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su_harvieAuthor Commented:
it is  already in path.

I am using hash map before error in previous form and it is working fine.

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mhuntsCommented:
Where are you running this from? Command line? Or an application server?
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su_harvieAuthor Commented:
on application server.
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