Internal Server Error when root node does not exist

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I was trying to cleanup my DB as I had accidentally deleted the root node (0). When I use this script, it gives me an internal server error as follows:

• About to connect() to localhost port 7474 (#0)
• Trying 127.0.0.1... connected
• Connected to localhost (127.0.0.1) port 7474 (#0)

  DELETE /db/data/cleandb/xxxx HTTP/1.1 User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5 Host: localhost:7474 Accept: /

  < HTTP/1.1 500 Internal Server Error < Content-Type: application/json < Access-Control-Allow-Origin: * < Transfer-Encoding: chunked < Server: Jetty(6.1.25) <

• Connection #0 to host localhost left intact
• Closing connection #0 "Node[0]"