Rag model examples - When uploading a sample ".pdf" file its producing an exception.

After using the playground for quite sometime, I shifted from one example to other example of RAG models. Later when I uploaded the same pdf into the knowledge base, its giving an exception. While the same file was working properly till then. Then I tried with different files all formats like ".txt", and ".md" each of these too failed with same exception as provided below.

Attached the sample file uploaded during testing.uploaded_Software Engineer Resume.pdf

通过在 RAG 模型示例之间切换并上传附加的 PDF，在 playground 中重现该故障，然后尝试报告中的 .txt 和 .md 文件。从 issue 中显示的 exception 开始，并确认每种格式的文件都能成功上传到知识库。