Issue in CreateFlowCommand

[PremavathiP]

When i tried to use CreateFlowCommand(), I am getting the below error.

Error AccessDeniedException: User: arn:aws:iam::xxxxxxxx:user/xxxx is not authorized to perform: appflow:null on resource: arn:aws:appflow:us-east-1:xxxxxxxx:flow/null with an explicit deny

I also tried through postman and got the same error. Refer this
{
"message": "Unable to determine service/operation name to be authorized",
"type": "ACCESS_DENIED",
"statusCode": "403"
}
How to fix this error?