Error message when using stat_ellipse() function

I want to draw 95% confidence ellipses around my RNA-seq PCA plot data but when I use the stat_ellipse() function, I keep getting the error below. I only have 3 replicates per group so this may be the issue--is there any way to draw statistical ellipses around PCA data otherwise?

Too few points to calculate an ellipse
Too few points to calculate an ellipse
Too few points to calculate an ellipse
Too few points to calculate an ellipse
Too few points to calculate an ellipse
Too few points to calculate an ellipse
Warning message:
Removed 6 rows containing missing values or values outside the scale range (geom_path()).