Mulesoft training: Week 2 APIKit flow is not starting.

Error log:

ERROR 2017-09-01 14:19:35,210 [main] org.mule.module.launcher.application.DefaultMuleApplication: null

org.mule.module.apikit.exception.ApikitRuntimeException: Invalid API descriptor -- errors found: 1

RAML resource not found -- file: american-flights-api.raml

at org.mule.module.apikit.parser.ParserWrapperV1.validate(ParserWrapperV1.java:68) ~[mule-module-apikit-3.8.5-HF1.jar:?]

at org.mule.module.apikit.ParserService.validateRaml(ParserService.java:86) ~[mule-module-apikit-3.8.5-HF1.jar:?]

at org.mule.module.apikit.AbstractConfiguration.initialise(AbstractConfiguration.java:112) ~[mule-module-apikit-3.8.5-HF1.jar:?]

at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source) ~[?:?]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_144]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_144]

But I can see the american-flights-api.raml is present under training/src/main/api.

Thanks,

Harish