Numbers of left and right parentheses in Newick string not equal

```python
>>> tree = open("tree/tree.nwk").read()
>>> tree.count(")")
203738
>>> tree.count("(")
203738
```

Method 1:
```r
tre <- read.tree("./tree/tree.nwk")
```

Method 2:
```r
tre <- read.newick("./tree/tree.nwk")
```

I got same error when use method 1 or method2.
```
Error in FUN(X[[i]], ...) : numbers of left and right parentheses in Newick string not equal
```