My concern is what happens in this JQL query when your labels have spaces in them? I think that this could explain why you're seeing this specific JQL error. You don't see that kind of error if your query is getting parsed correctly. If I'm correct then I would expect that your Jira site has at least one label that looks like this 'May Jun' or '2018 Jun' (without quotes).
From looking at your syntax my fear is that we're not providing the URI encoding needed on the URL level to make this work. Those label names can contain spaces, so the JQL should either use quotes before handle (single or double) or it would need to parse out labels with space values and convert them to a %20
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