ApiExceptions result in parse error

[canavese]

When an ApiException is returned by the Xero API, a parsing exception occurs, apparently because it is expecting JSON but getting XML.

It's happening at lib/xeroizer/http_response.rb, line 130:

    def raise_error!
      begin
        error_details = JSON.parse(response.plain_body)

This is the exception that gets raised:

unexpected token at '<ApiException xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <ErrorNumber>10</ErrorNumber>
  <Type>ValidationException</Type>
  <Message>A validation exception occurred</Message>
  <Elements>
    <DataContractBase xsi:type="Invoice">
      <ValidationErrors>
        <ValidationError>
          <Message>Invoice not of valid status for modification</Message>
        </ValidationError>
        <ValidationError>
          <Message>This document cannot be edited as it has a payment or credit note allocated to it.</Message>
        </ValidationError>
      </ValidationErrors>
...

Thanks!