Error in grid.Call.graphics(C_rect, x$x, x$y, x$width, x$height, resolveHJust(x$just, : invalid RGB specification

[mansi-aggarwal-2504]

I am manually providing palette and background colours in flametree_plot function. But I am getting the following error:

Error in grid.Call.graphics(C_rect, x$x, x$y, x$width, x$height, resolveHJust(x$just,  : 
  invalid RGB specification

The code works fine if I remove the two parameters.

background = "##f6b6a6"
palette = c("#66ABD5", "#005073", "#66abd5")