OpenClauseException
Example
{
	"code": "OpenClauseException",
	"target": "Unknown",
	"details": [
		{
			"code": "OpenClauseException",
			"number": 46,
			"message": "Error parsing $filter.",
			"description": "The $filter value '-0-' had an uneven number of open parenthesis '(' and close parenthesis ')'.  Please check your query and try again.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/OpenClauseException",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that your $filter value has a mismatched open parenthesis / close parenthesis. When parsing your query, AvaTax will check criteria in a parenthesis before anything outside of the parenthesis. To do this correctly, there must always be a close parenthesis ) for each open parenthesis (.