Please follow the structure and colnames of lrpairs or demo_lrpairs() as follows:

# lrpairs is a data.frame object with 3 columns

Replace the lrpairs with lrpairs_custom in the function of find_lr_path() to infer cell-cell communications

find_lr_path(object, lrpairs = lrpairs_custom, pathways, max_hop)