Hi Qian, On 6 Jul 2005, qli at jax.org wrote: > Everything looked fine until I tried to run function "gcrma" with my > real data. The system gave me an error message said: no slot of name > "Imports" for this object of class "localPkg". If BioConductor was previously (or currently) installed on the system you are using, it is possible that you are picking up old versions. We can help answer that if you could, after reproducing the error, report the output of: sessionInfo() .libPaths() Thanks for the detailed report. I'm sure we'll get you going soon. Best, + seth