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How to resolve "TNS-12520 TNS:listener could not find available handler for requested type"?

I have brand new MacBook Pro (Mac OS 10.6.3) and installed Oracle's SQLDeveloper. After doing so, I set the connection and was connecting just fine. But after an hour or so I got "TNS-12520 TNS:listener could not find available handler for requested type". I wonder how can I fix it?

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