Error of netVisual_bubble plotting

[jiangxiuhan0310]

Hi, thanks for such amazing package. I have encountered one problem when using netVisual_bubble.

netVisual_bubble(cellchat, sources.use = c('0:Epithelial','1:Epithelial','3:Epithelial'), 
                 targets.use = c('0:Macrophages','1:Macrophages','2:Macrophages','3:Macrophages','4:Macrophages',
                                 '5:Macrophages','6:Macrophages'), 
                 comparison = c('ZY','WZY'),
                 remove.isolate = FALSE )

Comparing communications on a merged object 

Error in `levels<-`(`*tmp*`, value = as.character(levels)) : 
  factor level [2] is duplicated

Could you tell me how to solve this problem?