知识库 上传txt 文档后报错

文本上传后报错 是为什么呢？
code=105000004 message=SearchStore operation failed: store search store failed, err: [slices2Columns] embed failed, [Ark] CreateEmbeddings error: RequestError code: 400, err: can't fetch endpoint sts token without endpoint, request_id: 202508260410230000247652A1A6706C57

The report provides no source files, tests, or entry points; begin by reproducing the knowledge-base TXT upload and tracing the embedding request that returns the Ark STS endpoint error. Done means identifying the configuration or integration failure and confirming that TXT uploads complete successfully with a regression check.

Written by the indexing model from the issue text.