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[EAEPPS]

AFTER INSTALLING SUCCESSFULLY I GET THE FOLLOWING ERROR AND CANNOT LOGIN AS ADMIN:
502 - Web server received an invalid response while acting as a gateway or proxy server.
There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.
WHAT CAN I OR MY HOSTING COMPANY DO TO SOLVE THE ERROR???