Show warning when HF_TOKEN is not specified

app.py

@@ -21,6 +21,7 @@ SHARED_UI_WARNING = f'''# Attention - This Space doesn't work in this shared UI.
 
 <center><a class="duplicate-button" style="display:inline-block" target="_blank" href="https://huggingface.co/spaces/{SPACE_ID}?duplicate=true"><img src="https://img.shields.io/badge/-Duplicate%20Space-blue?labelColor=white&style=flat&logo=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAP5JREFUOE+lk7FqAkEURY+ltunEgFXS2sZGIbXfEPdLlnxJyDdYB62sbbUKpLbVNhyYFzbrrA74YJlh9r079973psed0cvUD4A+4HoCjsA85X0Dfn/RBLBgBDxnQPfAEJgBY+A9gALA4tcbamSzS4xq4FOQAJgCDwV2CPKV8tZAJcAjMMkUe1vX+U+SMhfAJEHasQIWmXNN3abzDwHUrgcRGmYcgKe0bxrblHEB4E/pndMazNpSZGcsZdBlYJcEL9Afo75molJyM2FxmPgmgPqlWNLGfwZGG6UiyEvLzHYDmoPkDDiNm9JR9uboiONcBXrpY1qmgs21x1QwyZcpvxt9NS09PlsPAAAAAElFTkSuQmCC&logoWidth=14" alt="Duplicate Space"></a></center>
 '''
+
 if os.getenv('SYSTEM') == 'spaces' and SPACE_ID != ORIGINAL_SPACE_ID:
     SETTINGS = f'<a href="https://huggingface.co/spaces/{SPACE_ID}/settings">Settings</a>'
 else:
@@ -32,6 +33,13 @@ You can assign a GPU in the {SETTINGS} tab if you are running this on HF Spaces.
 </center>
 '''
 
+HF_TOKEN_NOT_SPECIFIED_WARNING = f'''# Attention - The environment variable `HF_TOKEN` is not specified. Please specify your Hugging Face token with write permission as the value of it.
+<center>
+You can check and create your Hugging Face tokens <a href="https://huggingface.co/settings/tokens" target="_blank">here</a>.
+You can specify environment variables in the "Repository secrets" section of the {SETTINGS} tab.
+</center>
+'''
+
 HF_TOKEN = os.getenv('HF_TOKEN')
 
 
@@ -50,6 +58,8 @@ with gr.Blocks(css='style.css') as demo:
         show_warning(SHARED_UI_WARNING)
     if not torch.cuda.is_available():
         show_warning(CUDA_NOT_AVAILABLE_WARNING)
+    if not HF_TOKEN:
+        show_warning(HF_TOKEN_NOT_SPECIFIED_WARNING)
 
     gr.Markdown(TITLE)
     with gr.Tabs():