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

PDF is hosted on: http://http%3A%2F%2Fweb.mbuslc.ac.th%2Fwp-content%2Fuploads%2F2020%2F03%2F%E0%B8%A3%E0%B8%B1%E0%B8%9A%E0%B8%95%E0%B8%A3%E0%B8%87%E0%B8%A3%E0%B8%AD%E0%B8%9A%E0%B8%AA%E0%B8%AD%E0%B8%8763.pdf but this site is: https://slc.mbu.ac.th