PROC X11 may result in the following Read Access Violation error when an ARIMA statement is specified:

ERROR: Read Access Violation In Task [ X11 )
Exception occurred at (019A43B0)

The Read Access Violation occurs in a memory management subroutine called by PROC X11 during the final estimation of the ARIMA parameters. Because the memory allocation is dependent on the number of observations in the data set and the number of terms in the ARIMA model, the error may occur sporadically, depending on these two components.

To circumvent the problem, you can perform the analysis using the X12 procedure rather than the X11 procedure.