Problems using Sankey and d3tree htmlwidgets at the same time on R Notebook?

I am using R laptop for data analysis. I want to do Sankey and d3tree htmlwidgets on an R laptop at the same time.

I put snakey and then d3tree sample code in r chunk, output printed nicely on rstudio
When I entered the preview button, the sankey output appeared well in the html.
But the d3tree output is not being output to html.

I tried to put d3tree and then sankey. the result is that two of d3tree and sankey dosen't render to html.

What is the problem? Can I solve these problems?

example code as shown below

---
title: "test"
output: html_notebook
---
```{r, echo=FALSE}
library(networkD3)
library(treemap)
library(d3treeR)
```

```{r, echo=FALSE}
net_cycles <- list(
  links = data.frame(
    source = c(0,0,0,1,1,5),
    target = c(1,2,3,4,5,0),
    value = 10
  ),
  nodes = data.frame(
    name = letters[1:6]
  )
)
```

```{r, echo=FALSE}
data(business)
business$employees.growth <- business$employees - business$employees.prev
tree <- treemap(business,
          index=c("NACE1", "NACE2"),
          vSize="employees",
          vColor="employees.growth",
          type="value",
          palette="-RdGy",
          range=c(-30000,30000))
```


```{r}
sankeyNetwork(
  net_cycles$links,
  net_cycles$nodes,
  Value = "value"
)

d3tree2(
  # Brewer Red-White-Grey palette reversed with predefined range
  tree
  ,rootname = "World"
)
```

      

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