系统发育多样性指数的计算

在计算系统发育多样性指数遇到的问题,请问如何解决

```r
Error in UseMethod("is.rooted") : 
  no applicable method for 'is.rooted' applied to an object of class "NULL"
In addition: Warning message:
In drop.tip(tree, treeabsent) : drop all tips of the tree: returning NULL

```

你用的哪个包

您好,我用的是picante这个包@WEIXIN_398529324

您好,请问解决了吗?