[Bug]:似乎无法处理md文件，转换成pdf过程中出错 #119
Description
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Describe the bug
这个项目很好，特别是引导式学习很赞，期待持续完善。
我测试中添加了3个KB，有pdf也有md文档，看到docker容器输出如下日志：
INFO: Initializing LightRAG with parameters: {'working_dir': '/app/data/knowledge_bases/DeepTutor_Quickstart/rag_storage'}
DEBUG: Process 8 Shared-Data already initialized (multiprocess=False)
INFO: [] Created new empty graph file: /app/data/knowledge_bases/DeepTutor_Quickstart/rag_storage/graph_chunk_entity_relation.graphml
DEBUG: Process 8 storage namespace already initialized: [full_docs]
DEBUG: Process 8 storage namespace already initialized: [text_chunks]
DEBUG: Process 8 storage namespace already initialized: [full_entities]
DEBUG: Process 8 storage namespace already initialized: [full_relations]
DEBUG: Process 8 storage namespace already initialized: [entity_chunks]
DEBUG: Process 8 storage namespace already initialized: [relation_chunks]
DEBUG: Process 8 storage namespace already initialized: [llm_response_cache]
DEBUG: Process 8 storage namespace already initialized: [doc_status]
DEBUG: Process 8 storage namespace already initialized: [parse_cache]
INFO: Multimodal processors initialized with context support
INFO: Available processors: ['image', 'table', 'equation', 'generic']
INFO: Context configuration: ContextConfig(context_window=1, context_mode='page', max_context_tokens=2000, include_headers=True, include_captions=True, filter_content_types=['text'])
INFO: LightRAG, parse cache, and multimodal processors initialized
INFO: Starting complete document processing: /app/data/knowledge_bases/DeepTutor_Quickstart/raw/README.md
INFO: Starting document parsing: /app/data/knowledge_bases/DeepTutor_Quickstart/raw/README.md
INFO: Using mineru parser with method: auto
INFO: Using generic parser for .md file (method=auto)...
[KnowledgeInit] ○
Processing: README.md
[KnowledgeInit] → [kb_init_20260113_094802_ad6aa4d1] Processing: README.md (1/2, 50%) - File: README.md
[KnowledgeInit] ✗ ✗ Error processing README.md: Failed to convert text file README.md to PDF: paraparser: syntax error: parse ended with 1 unclosed tags
para
[KnowledgeInit] ✗ Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/raganything/parser.py", line 371, in convert_text_to_pdf
story.append(Paragraph(line, normal_style))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/reportlab/platypus/paragraph.py", line 1859, in init
self._setup(text, style, bulletText or getattr(style,'bulletText',None), frags, cleanBlockQuotedText)
File "/usr/local/lib/python3.11/site-packages/reportlab/platypus/paragraph.py", line 1880, in _setup
style, frags, bulletTextFrags = _parser.parse(text,style)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/reportlab/platypus/paraparser.py", line 3221, in parse
return self._complete_parse()
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/reportlab/platypus/paraparser.py", line 3155, in _complete_parse
self._syntax_error('parse ended with %d unclosed tags\n %s' % (len(self._stack),'\n '.join((x.__tag__ for x in reversed(self._stack)))))
File "/usr/local/lib/python3.11/site-packages/reportlab/platypus/paraparser.py", line 2780, in _syntax_error
raise ValueError('paraparser: syntax error: %s' % message)
ValueError: paraparser: syntax error: parse ended with 1 unclosed tags
para
During handling of the above exception, another exception occurred:
return self.parse_text_file(file_path, output_dir, lang, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/raganything/parser.py", line 1128, in parse_text_file
pdf_path = self.convert_text_to_pdf(text_path, output_dir)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/raganything/parser.py", line 422, in convert_text_to_pdf
raise RuntimeError(
RuntimeError: Failed to convert text file README.md to PDF: paraparser: syntax error: parse ended with 1 unclosed tags
para
[KnowledgeInit] ✗ [kb_init_20260113_094802_ad6aa4d1] Failed to process file: README.md (1/2, 50%) - File: README.md - Error: Failed to convert text file README.md to PDF: paraparser: syntax error: parse ended with 1 unclosed tags
para
[KnowledgeInit] ○
Processing: docker_update_guide.md
[KnowledgeInit] → [kb_init_20260113_094802_ad6aa4d1] Processing: docker_update_guide.md (2/2, 100%) - File: docker_update_guide.md
INFO: Starting complete document processing: /app/data/knowledge_bases/DeepTutor_Quickstart/raw/docker_update_guide.md
INFO: Starting document parsing: /app/data/knowledge_bases/DeepTutor_Quickstart/raw/docker_update_guide.md
INFO: Using mineru parser with method: auto
INFO: Using generic parser for .md file (method=auto)...
WARNING:root:WenQuanYi font not found at /usr/share/fonts/wqy-microhei/wqy-microhei.ttc. Chinese characters may not render correctly.
INFO: 172.17.0.1:58648 - "WebSocket /api/v1/knowledge/DeepTutor_Quickstart/progress/ws" [accepted]
INFO: connection open
[ProgressBroadcaster] Connected WebSocket for KB 'DeepTutor_Quickstart' (total: 1)
INFO: 172.17.0.1:58664 - "GET /api/v1/knowledge/health HTTP/1.1" 200 OK
[Knowledge] ○ Found 3 knowledge bases: ['Claude_Skills_Quickstart', 'DeepTutor_Quickstart', 'Kotlin_WebAssembly_Quickstart']
Warning: Knowledge base 'Claude_Skills_Quickstart' is not in kb_config.json, but directory exists
Warning: Knowledge base 'DeepTutor_Quickstart' is not in kb_config.json, but directory exists
Warning: Knowledge base 'Kotlin_WebAssembly_Quickstart' is not in kb_config.json, but directory exists
[Knowledge] ○ Returning 3 knowledge bases
INFO: 172.17.0.1:58664 - "GET /api/v1/knowledge/list HTTP/1.1" 200 OK
其中，处理md文件过程中的aise RuntimeError(
RuntimeError: Failed to convert text file README.md to PDF: paraparser: syntax error: parse ended with 1 unclosed tags 这种错误是什么原因，如何解决？
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