RateLimitExceededError
Example
{
	"code": "RateLimitExceededError",
	"target": "Unknown",
	"details": [
		{
			"code": "RateLimitExceededError",
			"number": 1723,
			"message": "The request has exceeded the maximum number of concurrent transactions.",
			"description": "The request has exceeded the maximum number of concurrent transactions.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/RateLimitExceededError",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that the request has exceeded the maximum number of concurrent transactions.