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Hi, having left my Ktor-Project (Ktor-Version 2.0.0-beta-1) untouched (and it was working just fine) for a while I came back and when I clicked "Run Server"
I get the following exception and I have no idea what's going on? Any hint?

Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
	at com.auth0.jwk.UrlJwkProvider.&lt;init&gt;(UrlJwkProvider.java:80)
	at com.auth0.jwk.JwkProviderBuilder.build(JwkProviderBuilder.java:148)
	at de.tellsiggi.auth.config.jwt.JwtConfigKt.configure(JwtConfig.kt:31)
	at de.tellsiggi.ApplicationKt$module$1$1.invoke(Application.kt:34)
	at de.tellsiggi.ApplicationKt$module$1$1.invoke(Application.kt:33)
	at io.ktor.server.auth.jwt.JWTAuthKt.jwt(JWTAuth.kt:333)
	at io.ktor.server.auth.jwt.JWTAuthKt.jwt$default(JWTAuth.kt:329)

Could you please try to remove a Gradle cache and clean the build?

Aleksei, thank you so much!! That solved it! In case anyone is having same issue I deleted Foler `%USERPROFILE%\.gradle\caches`  (on windows) and rebuild my project. Aleksei how did you know it was gradle cache?

Very often when no class or method found error occurs the problem is in a Gradle cache, especially when a code is left untouched.