Trying to start the WebUI gives out Error -- OSError: [WinError 123]

[Sl1pp1]

Hey Guys!

I just followed the tutorial and everything seems to work fine..even generating via the "txt2img_onnx" file.
But when I try to start the WebUI, it gives me this Error:

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Traceback (most recent call last):
File "C:\Users\Dave\Desktop\stable_diff\onnxUI.py", line 367, in
with gr.Blocks(title=title, css=custom_css) as demo:
File "C:\Users\Dave\Desktop\stable_diff\virtualenv\lib\site-packages\gradio\blocks.py", line 473, in init
if css is not None and Path(css).exists():
File "C:\Users\Dave\AppData\Local\Programs\Python\Python39\lib\pathlib.py", line 1407, in exists
self.stat()
File "C:\Users\Dave\AppData\Local\Programs\Python\Python39\lib\pathlib.py", line 1221, in stat
return self._accessor.stat(self)
OSError: [WinError 123] Die Syntax für den Dateinamen, Verzeichnisnamen oder die Datenträgerbezeichnung ist falsch: '\n #gen_button {height: 90px}\n #image_init {min-height: 400px}\n #image_init [data-testid="image"], #image_init [data-testid="image"] > div {min-height: 400px}\n #image_inpaint {min-height: 400px}\n #image_inpaint [data-testid="image"], #image_inpaint [data-testid="image"] > div {min-height: 400px}\n #image_inpaint .touch-none {display: flex}\n #image_inpaint img {display: block; max-width: 84%}\n #image_inpaint canvas {max-width: 84%; object-fit: contain}\n '

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The Translation for the german text is:
"The syntax for the file name, directory name or disk label is incorrect"

No clue what it is referring to

Any Idea whats wrong here?