plot problem on google colab

[sugizo]

environment
google colab

plot not show anything

%%R
chess5 <- Chess$new("k7/8/n7/8/8/8/8/7K b - - 0 1")
plot(chess5)

plot type ggplot cant load chess pieces

%%R
chess5 <- Chess$new("k7/8/n7/8/8/8/8/7K b - - 0 1")
plot(chess5, type = "ggplot")