[amelia] Amelia input file structure - what should it be?

Hello, I have no prior experience with Amelia, and am trying to use it to impute missing observations in column "ON" in the enclosed "1ON.csv" file. I use only 3 variables: ON, month2 (as time series index), source2 (as cross-sectional index). So far I have only managed to get the following alternative error messages: Amelia Error Code: 33 The time series and cross sectional variables cannot be transformed. (when I try to transform "month2" into ordinal and "source2" into nominal variables) Error in rowSums(AMr1) : 'x' must be an array of at least two dimensions (with no variable transformation) I guess the problem might be caused by the file structure. Could someone help me out? E.g., by sending me a sample input file on which Amelia works right? Many thanks in advance, and best regards, Pawel