There is a very weird issue coming up. I have all the plugins installed once. But when I try to run ...

# ktor

[Himanshu Singh]

There is a very weird issue coming up. I have all the plugins installed once. But when I try to run the project I get

Exception in thread "main" io.ktor.application.DuplicateApplicationFeatureException: Conflicting application feature is already installed with the same key as `CORS`

And the code looks like:

fun main() {
    embeddedServer(Netty, port = 8081, host = "0.0.0.0") {
        configureHTTP()
        configureOauth()
        configureRoutingAndSerialization()
        configureStatusPages()
    }.start(wait = true)
}

The weird part is:
The first feature which is inside the blocks always throws the error. In this case is HTTP but if I take Oauth to first position it will throw exception of Authentication

[Aleksei Tirman [JB]]

This is most likely it https://youtrack.jetbrains.com/issue/KTOR-2734. The fix will be released in 1.6.1.