https://userapps.support.sap.com/sap/support/knowledge/en/2591866
2591866 - BPC Web page blank, empty or grey with error "Failed to load 'sap/epm/ui/main.js'" | SAP...
You log on to BPC web, but the page is blank. Error "Failed to load 'sap/epm/ui/main.js' from resources/sap/epm/ui/main.js: 404 - NOT FOUND - REQUESTED...