[R] Problem with effects package

[Lars Bishop]

Dear List,

Several times I use this package I get the error message shown below.
When I work out simple examples, it turns out to be fine, but when
working with real and moderate size data sets I always get the same
error.

Do you know what could be the cause of the problem?


Error in apply(mod.matrix[, components], 1, prod) :
  subscript out of bounds
Error in plot(effect("myvariable", glm.sev1)) :
  error in evaluating the argument 'x' in selecting a method for
function 'plot'

Thanks,
Lars/