[R] Error when forecasting using ARIMA101

[Thomas Duellmann]

Hi there,

I am quite new to R and would like to use the arima101 forecast
approach in the "forecast"-library.
I tried to execute the following commands:
require(forecast)
var_1 <- c(372996.0)
var_1 <- ts(var_1, frequency=60)
var_2 <- arima(var_1,c(1,0,1),method="
CSS-ML")

Error in optim(init[mask], armaCSS, method = optim.method, hessian
 non-finite value supplied by optim

I don't really know where to find the cause of this error as I didn't
call "optim" in any way.
Could you give me a hint how to do it the right way?

Thanks a lot in advance.