Error when using heatmap on 1x6 gene sets

[rbutleriii]

"When two gene sets each with one or more lists need to be compared."
In this case I have a set of 6 lists to compare to a set of one list. newGOM works well, but drawHeatmap throws a heatmap.2 error:

Error in heatmap.2(plot.mat, cellnote = note.mat, main = main.txt, xlab = footnote,  :
  `x' must have at least 2 rows and 2 columns