你好，config.json中的这个“RoleArn”字段代表啥意思？
{ Error: NoPermission: No permission perform sts:AssumeRole on this Role. Maybe you are not authorized to perform sts:AssumeRole or the specified role does not trust y
ou
at STS._requestError (F:\work\work\web\aliyun-oss-node\server\node_modules\ali-oss\lib\sts.js:116:13)
at _requestError.next ()
at onFulfilled (F:\work\work\web\aliyun-oss-node\server\node_modules\co\index.js:65:19)
at F:\work\work\web\aliyun-oss-node\server\node_modules\co\index.js:54:5
at new Promise ()
at co (F:\work\work\web\aliyun-oss-node\server\node_modules\co\index.js:50:10)
at toPromise (F:\work\work\web\aliyun-oss-node\server\node_modules\co\index.js:118:63)
at next (F:\work\work\web\aliyun-oss-node\server\node_modules\co\index.js:99:29)
at onFulfilled (F:\work\work\web\aliyun-oss-node\server\node_modules\co\index.js:69:7)
at
status: 403,
code: 'NoPermission',
message: 'NoPermission: No permission perform sts:AssumeRole on this Role. Maybe you are not authorized to perform sts:AssumeRole or the specified role does not trus
t you',
rockuw
