我是对话流客户端/实现库的新手，我一直在关注本教程https://youtu.be/0NXqwT3Y09E。在Firebase中运行它时，出现此错误

 7 PERMISSION_DENIED: IAM permission 'dialogflow.sessions.detectIntent' on 'projects/customtestbot-wkogxn/agent' denied.
at Object.callErrorFromStatus (/srv/node_modules/@grpc/grpc-js/build/src/call.js:30:26)
at Http2CallStream.call.on (/srv/node_modules/@grpc/grpc-js/build/src/client.js:96:33)
at emitOne (events.js:121:20)
at Http2CallStream.emit (events.js:211:7)
at process.nextTick (/srv/node_modules/@grpc/grpc-js/build/src/call-stream.js:75:22)
at _combinedTickCallback (internal/process/next_tick.js:132:7)
at process._tickDomainCallback (internal/process/next_tick.js:219:9)

请任何人向我解释该问题该怎么办