R help - Mar 2012 - problem with effects : 'subscript out of bounds'

hello.  help with effects plots.  here's the last bit of code before running
the model and then the effects, then the error.

nor.dem <- norway$v162  ## nor.dem is my DV & it is continuous.
nor.dem <- as.numeric(nor.dem)-5
str(nor.dem)

(i had to do a great deal of coding here so i am snipping down to the end)

tmp[which(norway$v128 == "trust completely" & norway$v127 ==
"trust completely")] <- "generalized"
tmp <- factor(tmp, levels=c("particular", "generalized",
"other"))
norway$trust <- tmp
nor.trust <- as.factor(norway$trust)  ####  nor.trust is my IV, a factor as
you can see.

n.diversity <- norway$v221 ## control

n.net <- norway$v228  ##control  (there are others but they were coded the
same)


n.mod1 <- lm(nor.dem ~ nor.trust + n.diversity + n.age + n.sex + n.educ +
famecon + n.net)  ### linear model.  all of these variables already are specific
to the dataset which i called 'norway' so there is no need to specify in
the model.

summary(n.mod1)
> plot(effect("nor.trust", n.mod1), multiline=T)
Error in plot(effect("nor.trust", n.mod1), multiline = T) : 
  error in evaluating the argument 'x' in selecting a method for
function 'plot': Error in apply(mod.matrix[, components], 1, prod) :
  subscript out of bounds



~~this ran perfectly on my previous dataset so i am unsure of the issue.  thanks
in advance.

if that is  not specific (or not general) enough:

newDV <- dat$DV  ## newDV is my DV & it is continuous.
newDV <- as.numeric(newDV)-5
str(newDV)


(i had to do a great deal of coding here so i am snipping down to the end)


tmp[which(dat$v1 == "stuff" & dat$v2 == "more stuff")]
<- "lots of stuff"
tmp <- factor(tmp, levels=c("la", "la la", "fa la
la"))
dat$v3 <- tmp
newIV <- as.factor(dat$v3)  ####  newIV is my IV, a factor as you can see.

n.var4 <- dat$v4 ## control

n.var5 <- dat$v5  ##control  (there are others but they were coded the same)


n.mod1 <- lm(newDV ~ newIV + v4 + v5 + v6 + v7 + v8 + v9, data=dat)  ###
linear model.  all of these variables already are specific to the dataset which
i called 'norway' so there is no need to specify in the model.

summary(n.mod1)
> plot(effect("newIV", n.mod1), multiline=T)
Error in plot(effect("nor.trust", n.mod1), multiline = T) : 
  error in evaluating the argument 'x' in selecting a method for
function 'plot': Error in apply(mod.matrix[, components], 1, prod) :
  subscript out of bounds



~~this ran perfectly on my previous dataset so i am unsure of the issue.  thanks
in advance.

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