Getting an instant error

Sorry I am permanently getting this error

```
> cluster_map(marker_file_list, edge_cutoff = 0.1, output = getwd(), single_obj_list = single_obj_list, comb_obj = objList$p7)
match sub-clusters
Error in as.phylo(hcluster) : 
  Formula must be of the kind "~A1/A2/.../An".
Called from: as.phylo(hcluster)
Browse[1]> Browse[1]
```

Help me please