Problems with root_cells

[Angle28]

Hi, I'm running this code
root_cells<-"AAACCTGCACACATGT-1_1_2"
cds <- order_cells(cds,root_cells=root_cells)
These problems arise
Error: principal graph is too large. order_cells doesn't support more than 10 thousand centroids.
Traceback:

1. order_cells(cds, root_cells = root_cells)
2. assertthat::assert_that(igraph::vcount(principal_graph(cds)[[reduction_method]]) <
   . 10000, msg = paste("principal graph is too large. order_cells doesn't support",
   . "more than 10 thousand centroids."))
   The amount of data is not very large, 20,000 cells have this problem, how can I solve it