how to fix this ?

[ApexArtist]

Cloning assets into G:\AI\Stable Diffusion\stable-diffusion-webui\repositories\stable-diffusion-webui-assets...
'" (path to your Git installation, if needed)"' is not recognized as an internal or external command,
operable program or batch file.
Traceback (most recent call last):
File "G:\AI\Stable Diffusion\stable-diffusion-webui\launch.py", line 48, in
main()
File "G:\AI\Stable Diffusion\stable-diffusion-webui\launch.py", line 39, in main
prepare_environment()
File "G:\AI\Stable Diffusion\stable-diffusion-webui\modules\launch_utils.py", line 411, in prepare_environment
git_clone(assets_repo, repo_dir('stable-diffusion-webui-assets'), "assets", assets_commit_hash)
File "G:\AI\Stable Diffusion\stable-diffusion-webui\modules\launch_utils.py", line 192, in git_clone
run(f'"{git}" clone --config core.filemode=false "{url}" "{dir}"', f"Cloning {name} into {dir}...", f"Couldn't clone {name}", live=True)
File "G:\AI\Stable Diffusion\stable-diffusion-webui\modules\launch_utils.py", line 116, in run
raise RuntimeError("\n".join(error_bits))
RuntimeError: Couldn't clone assets.
Command: " (path to your Git installation, if needed)" clone --config core.filemode=false "https://github.com/AUTOMATIC1111/stable-diffusion-webui-assets.git" "G:\AI\Stable Diffusion\stable-diffusion-webui\repositories\stable-diffusion-webui-assets"
Error code: 1
Press any key to continue . . .

[wkpark]

https://github.com/AUTOMATIC1111/stable-diffusion-webui?tab=readme-ov-file#automatic-installation-on-windows

1. Install Python 3.10.6 (Newer version of Python does not support torch). checking "Add Python to PATH".
2. Install git.

did you install git ?

check git command first, for example, 1) open cmd.exe command line prompt, 2) run git help on your cmd window