rpcminer: Could not retrieve work from RPC server.

Hi all,

For some reason I cannot get rpcminer to perform correctly.

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Could not retrieve work from RPC server.
CURL return value = 22
No blocks are being hashed right now. This can happen if the application is
still starting up, you supplied incorrect parameters, or there is a
communications error connecting to the RPC server.

Curl 7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8l zlib/1.2.3

Mac OS X 10.6.7 / 2.8 GHz Intel Core i5 / 4GB 1333 MHz DDR3 / ATI Radeon HD 5750
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Any ideas or have I missed a FAQ / wiki?

Adrian.