[Opensymphony-oscache] Cache tag execution giving null pointer exception...

When I am trying to use the cache tag, the following exception is occured:

java.lang.NullPointerException
        at java.io.Reader.<init>(Reader.java:61)
        at java.io.InputStreamReader.<init>(InputStreamReader.java:80)
        at java.util.Properties.load(Properties.java:266)
        at com.opensymphony.module.oscache.base.AbstractCacheAdministrator.loadProps(AbstractCacheAdministrator.java:381)
        at com.opensymphony.module.oscache.base.AbstractCacheAdministrator.<init>(AbstractCacheAdministrator.java:315)
        at com.opensymphony.module.oscache.web.ServletCacheAdministrator.<init>(ServletCacheAdministrator.java:299)
        at com.opensymphony.module.oscache.web.ServletCacheAdministrator.getInstance(ServletCacheAdministrator.java:343)

I copied oscache.properties etc.. properly. but still not able to execute cache tag.

Any help is appreciated.

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