Error : "Labs don not fit even at cex 0.15,there may be some overplotting" while creating decission tree

When I tried plot a regression tree using fancyRpartPlot(), however the tree does not get plotted due to the error “Labs don not fit even at cex 0.15,there may be some overplotting”, I was working on 47k observations …can anybody help me on how to resolve this.