R help - Dec 2003 - Error in randomForest.default(m, y, ...) : negative length vectors are not allowed

Hi,

what i'm doing wrong?
I'm using a data.frame with ~ 90.000 instances
and 7 attributes, 5 are binary recoded 
1 independend variable are a real one 
and the target is a real one,too.

The distributions are not very skewed in the dummy variables
,but in the real variables are ~ 60.000 
zero values instances, but zero means
no money is payed and is a important value!

Many thanks for help & suggestions,
regards,christian