Oops: IllegalArgumentException
Unexpected error : Unexpected Error, caused by exception IllegalArgumentException: controllers.admin.merchant.onsite

play.exceptions.UnexpectedException: Unexpected Error
        at play.Play.start(Play.java:597) ~[play-1.8.0-nosto-GA-13.jar:?]
        at play.server.Server.main(Server.java:169) [play-1.8.0-nosto-GA-13.jar:?]
Caused by: java.lang.IllegalArgumentException: controllers.admin.merchant.onsite
        at java.base/java.lang.ClassLoader.definePackage(ClassLoader.java:2239) ~[?:?]
        at play.classloading.ApplicationClassloader.loadApplicationClass(ApplicationClassloader.java:154) ~[play-1.8.0-nosto-GA-13.jar:?]
        at play.classloading.ApplicationClassloader.getAllClasses(ApplicationClassloader.java:447) ~[play-1.8.0-nosto-GA-13.jar:?]
        at play.Play.start(Play.java:551) ~[play-1.8.0-nosto-GA-13.jar:?]

java.lang.LinkageError: loader play.classloading.ApplicationClassloader @f2bec99 attempted duplicate interface definition for controllers.admin.merchant.onsite.package-info. (controllers.admin.merchant.onsite.package-info is in unnamed module of loader play.classloading.ApplicationClassloader @f2bec99, parent loader 'app')
        at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[?:?]
        at play.classloading.ApplicationClassloader.loadApplicationClass(ApplicationClassloader.java:164) ~[play-1.8.0-nosto-GA-13.jar:?]
        at play.classloading.ApplicationClassloader.getAllClasses(ApplicationClassloader.java:451) ~[play-1.8.0-nosto-GA-13.jar:?]
        at play.Play.start(Play.java:551) ~[play-1.8.0-nosto-GA-13.jar:?]
        at play.server.Server.main(Server.java:169) [play-1.8.0-nosto-GA-13.jar:?]