Error number 3 in 0

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Error number 3 in 0

walido
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Hi,
i have this error since yesterday and all i did is trying to add a excel plugin
so i followed the tutorial , i added the jxl jar in lib directory and i putted the line
in xwiki.cfg but after having this error i rolled back all my changes i deleted the jar and restored
the xwiki.cfg to the same old state but still have the error:
HTTP ERROR: 500

Error number 3 in 0: Could not initialize main XWiki context
Wrapped Exception: Error number 3001 in 3: Cannot load class com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from param xwiki.store.migration.manager.class
Wrapped Exception: Error number 0 in 3: Exception while hibernate execute
Wrapped Exception: invalid configuration

RequestURI=/xwiki/bin/view/Main/

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what should i do, my work is lost?
help on this one please thank you very much