Security Error: PDF files must be hosted on the same domain as this site.

PDF is hosted on: http://%2Fwp-content%2Fuploads%2F2019%2F05%2F%E0%B8%9B%E0%B8%A3%E0%B8%B0%E0%B8%81%E0%B8%B2%E0%B8%A8%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%9C%E0%B8%B9%E0%B9%89%E0%B8%A1%E0%B8%B1%E0%B8%AA%E0%B8%B4%E0%B8%97%E0%B8%98%E0%B8%B4%E0%B9%8C%E0%B8%AA%E0%B8%AD%E0%B8%9A-%E0%B8%9E%E0%B8%B4%E0%B9%80%E0%B8%A8%E0%B8%A96221052019085217-1.pdf but this site is: https://slc.mbu.ac.th