Error in Single-cell

Hi all,

I am having some trouble to plot my single-cell ATAC data due to an error.

Error in, as.graphicsAnnot(x$label), x$x, x$y, :
X11 font -adobe-helvetica-%s-%s---%d-------*, face 1 at size 11 could not be loaded

I would appreciate any suggestions that you may have to solve this error.

Thank you very much in advance.