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I have a problem with Koin - I get the DuplicateApplicationFeatureException. I have 3 modules with installed Koin plugin/feature.

In old versions of ktor this exception was mistakenly thrown when there is an exceptions in app initialization. In the newest version you will receive the actual exception. Check your configs and plugins installs. Or put a breakpoint <https://github.com/ktorio/ktor/blob/b3ca535610f232d506aa2d104cd20fa1c27ba665/ktor-server/ktor-server-host-common/jvm/src/io/ktor/server/engine/ApplicationEngineEnvironmentReloading.kt#L321|https://github.com/ktorio/ktor/blob/b3ca535610f232d506aa2d104cd20fa1c27ba665/ktor-[…]/io/ktor/server/engine/ApplicationEngineEnvironmentReloading.kt> to see the real exception