MissingLine
Example
{
	"code": "MissingLine",
	"target": "Unknown",
	"details": [
		{
			"code": "MissingLine",
			"number": 311,
			"message": "Transactions must have at least one line.",
			"description": "The CreateTransactionModel object must have an element called 'lines', with at least one valid line record.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/MissingLine",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that you attempted to create a tax transaction with no lines. A transaction must have at least one line in order to be created. Please add a line to the transaction and try again.