InvalidFileContentType
Example
{
	"code": "InvalidFileContentType",
	"target": "Unknown",
	"details": [
		{
			"code": "InvalidFileContentType",
			"number": 186,
			"message": "The batch file -0- has invalid content type",
			"description": "The batch file content type can not be null or empty string or whitespace only.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/InvalidFileContentType",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that the file content type could not be determined correctly. Please select a valid file content type for your batch.