What is the reason for experiencing an UNEXPECTED_END_OF_QUERY error while using the Google Ads API Ruby client library?

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The UNEXPECTEDENDOF_QUERY error while using the Google Ads API Ruby client library is typically encountered when the query sent to the API is not constructed properly. This can be caused by missing or incomplete query parameters, incorrect syntax, or a malformed request. It is important to thoroughly review the query being sent and ensure that it is valid according to the API documentation. Additionally, the error may also be due to connectivity or server issues, so it is recommended to check for any outages or downtimes before attempting to submit the query again.