Could not resolve placeholder 'cf.api' in value "${cf.api}"

[kwangnam]

Can you tell me how to fix this? I cannot find any configuration in the properties.
Would you post general tips on how to compile these?
Thank you in advance.

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-11-16 19:44:59.319 ERROR 16476 --- [ main] o.s.boot.SpringApplication : Application startup failed

java.lang.IllegalArgumentException: Could not resolve placeholder 'cf.api' in value "${cf.api}"

2017-11-16 19:44:59.319 WARN 16476 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception thrown from LifecycleProcessor on context close

java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh'