Your reference to src="resources/sap-ui-cachebuster/sap-ui-core.js" is wrong.
Open the ABAP WAS URL http://[host]:[port]/sap/public/bc/ui5_ui5/ in your browser. This will display all the installed versions of the SAPUI5 library as shown in the image below.
For example if you like to use 1.24 , src will be
src="sap/public/bc/ui5_ui5/1.24/resources/sap-ui-core.js"