Problems with the example project

### Describe the error
Errors occurred during the execution of the example file. This caused the Python program to crash

### Code and Error
**Code**:
```shell
manim-render example_scenes.py OpeningManimExample
```

**Error**:
```shell
PS C:\tmp\manim> manim-render example_scenes.py OpeningManimExample
Warning: Using the default configuration file, which you can modify in c:\users\zeyecx\desktop\tmp\manim\manimlib\default_config.yml
If you want to create a local configuration file, you can create a file named custom_config.yml, or run manimgl --configc:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-79 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-114 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-116 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-104 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-105 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-110 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-107 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-103 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-111 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-102 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-101 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-112 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-108 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-97 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-115 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-44 not recognized
warnings.warn(f"{ref} not recognized")
c:\users\zeyecx\desktop\tmp\manim\manimlib\mobject\svg\svg_mobject.py:132: UserWarning: g1-109 not recognized
warnings.warn(f"{ref} not recognized")
```

### Environment
```shell
OS: nt
platform System: Windows
platform Release: 10
platform Version: 10.0.22000
platform Machine: AMD64
platform Node: Lenovo
platform Processor: Intel64 Family 6 Model 126 Stepping 5, GenuineIntel
platform Python: 3.9.6
platform Python Compiler: MSC v.1929 64 bit (AMD64)
platform Python Build: ('tags/v3.9.6:db3ff76', 'Jun 28 2021 15:26:21')
```