I've taken the approach of deleting and creating KBs. But when I tried to create one using the API playground like this: **curl -X POST https://api.vapi.ai/knowledge-base \ -H "Authorization: Bearer xxx" \ -H "Content-Type: application/json" \ -d '{ "provider": "trieve", "createPlan": { "type": "create", "chunkPlans": [ { "fileIds": [ "fname.txt" ] } ] }, "name": "stdRAG", "searchPlan": { "searchType": "hybrid", "scoreThreshold": 0.3 } }'** I get "failed to extract key for request id {hex-string}" I'm puzzled because I made the curl command using the playground, so I assume I can't have got the syntax wrong.