R help - May 2011 - error term for ANOVA of generalized randomized block design

Does anyone know how to write the code for an anova for a generalized
randomized block design?  I have two blocks (random) and three treatments
(fixed).  Each treatment has two reps at each site.  I know that for a RCBD
with no replication that an anova can be run using aov(object~Block *Trt),
but I think I need to specify an error term for the GRBD.

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