I am getting a strange error message when trying to use Dream:

> fitmm9 <- dream(vobj9, form9.dream,bigdemos)
Dividing work into 100 chunks...

Total:219 s
Error in r[cbind(1L:p, 1L:p)] <- 1 : subscript out of bounds

This is particularly strange because this is code from a previous session that is giving me this error. Its possible that I had to recreate my demos file from a .csv I keep, but I have checked and all of the variables in my model are present in the demos file and none are missing values. Has anyone encountered this problem or could you spot what probably is going wrong here?