Pdf viewer not see pdf file

Pdf viewer not see pdf file.

PDF.js v1.0.907 (build: e9072ac)
Message: Unexpected server response (204) while retrieving PDF “http://.com/g/index.php/*/article/download/1/1/”.

Please help me for solve problem.

The HTTP 204 response indicates that the system returned no content when the file was fetched. Check to ensure that this PDF actually exists in OJS and that it is found correctly in the files_dir.

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