R help - Feb 2007 - adf test: trend, no drift - rep: invalid 'times' argument

Hello!

I am applying the ADF.test function from package uroot to a time series of data.
When I apply the full test, incorporating drift and trend terms, the regressor
estimate of the drift term is not significantly different from zero. So I  apply
the test to a model without drift term, with deterministic trend only. But then
I always get the following error:

summary(ADF.test(wts=ts(seasons$summer, start=1850, frequency=1),
itsd=c(0,1,c(0)), regvar=0, selectlags=list(mode=c(1,2,3))))
Error in rep(NA, ncol(table)) : invalid 'times' argument
Error in summary(ADF.test(wts = ts(seasons$summer, start = 1850, frequency = 1),
:
	error in evaluating the argument 'object' in selecting a method for
function 'summary'

I have no idea why this error occurs. Any suggestions will be appreciated.

Regards,
Martin

-----------------------------------------------------------------
http://auto-motor-und-sport.bg/ 
? ?????? ? ??????!