WCMScriptHelper Failed to locate script

I'm using AEM 6.2 and I have been receiving below errors in my splunk logs when I hit my application

ERROR [ HEAD / HTTP/1.1] com.adobe.cq.sightly.WCMScriptHelper Failed to locate script main.js.

INFO [  HEAD / HTTP/1.1] com.test.models.SingleColumnTemplateModel inside SingleColumnTemplateModel model test servlet

ERROR [ HEAD / HTTP/1.1] com.adobe.cq.sightly.WCMScriptHelper Failed to locate script /etc/designs/test/css/MyFontsWebfontsKit.css.

ERROR [ HEAD / HTTP/1.1] com.adobe.cq.sightly.WCMScriptHelper Failed to locate script /etc/designs/test/css/FontKitLicense.css.

ERROR [ HEAD / HTTP/1.1] com.adobe.cq.sightly.WCMScriptHelper Failed to locate script /content/dam/test/css/quick-fix.css

I did troubleshoot the problem wherein java scripts & css are correctly added in the js.txt and css.txt files.

Is it some thing to do with the configuration part which should resolve it.

Kindly help.