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Your quoted JSON has a missing curly bracket at the end but I guess that was an error in copying. The only strange thing in your description is the argument to your DataSource constructor "some_php_file_with_some_get_params" . You don't usually add your get parameters to the URL in the constructor. That is what the initialRequest configuration attribute is for, which goes into the fourth argument of your DataTable constructor, which is missing in your code.

The URL you use for the DataSource constructor is the base URL, that which remains the same all through the transaction. If you include your get parameters in the base URL, your extra arguments in the call to sendRequest will be appended to those, possibly confusing your server. A confused server often responds with a nicely formatted HTML error message instead of the expected JSON reply, and that causes the MSG_ERROR.

Another possible cause for error is not escaping the query. You should use:

myDataSource.sendRequest('&query=' + encodeURIComponent(query) , ...

otherwise, certain queries for example, with a whitespace, will truncate the URL or confuse the server with strange arguments.

We haven't been doing things that way since 2.5.2. Autocomplete uses the same DataSource classes as DataTable does.

What versions are you using?