Ktor Sessions is missing @Serializable annotation

[bjhham]

Exception in thread "main" kotlinx.serialization.SerializationException: Serializer for class 'MySession' is not found.
Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.

	at kotlinx.serialization.internal.Platform_commonKt.serializerNotRegistered(Platform.common.kt:91)
	at kotlinx.serialization.internal.PlatformKt.platformSpecificSerializerNotRegistered(Platform.kt:28)
	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:134)
	at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:72)
	at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
	at io.ktor.server.sessions.SessionSerializerKt.defaultSessionSerializer(SessionSerializer.kt:40)
	at io.ktor.server.sessions.CookieSessionBuilder.<init>(SessionsBuilder.kt:323)
	at io.ktor.server.sessions.SessionsBuilderKt.cookie(SessionsBuilder.kt:212)
	at com.re.ka.ku.plugins.SecurityKt.configureSecurity$lambda$1(Security.kt:25)
	at io.ktor.server.application.CreatePluginUtilsKt.createRouteScopedPluginInstance(CreatePluginUtils.kt:283)
	at io.ktor.server.application.CreatePluginUtilsKt.access$createRouteScopedPluginInstance(CreatePluginUtils.kt:1)
	at io.ktor.server.application.CreatePluginUtilsKt$createRouteScopedPlugin$1.install(CreatePluginUtils.kt:137)
	at io.ktor.server.application.CreatePluginUtilsKt$createRouteScopedPlugin$1.install(CreatePluginUtils.kt:123)
	at io.ktor.server.application.ApplicationPluginKt.install(ApplicationPlugin.kt:100)
	at com.re.ka.ku.plugins.SecurityKt.configureSecurity(Security.kt:11)

[aretii]

any solution on this?

Exception in thread "main" kotlinx.serialization.SerializationException: Serializer for class 'MySession' is not found.
Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.

	at kotlinx.serialization.internal.Platform_commonKt.serializerNotRegistered(Platform.common.kt:91)
	at kotlinx.serialization.internal.PlatformKt.platformSpecificSerializerNotRegistered(Platform.kt:28)
	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:134)
	at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:72)
	at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
	at io.ktor.server.sessions.SessionSerializerKt.defaultSessionSerializer(SessionSerializer.kt:40)
	at io.ktor.server.sessions.CookieSessionBuilder.<init>(SessionsBuilder.kt:323)
	at io.ktor.server.sessions.SessionsBuilderKt.cookie(SessionsBuilder.kt:212)
	at com.re.ka.ku.plugins.SecurityKt.configureSecurity$lambda$1(Security.kt:25)
	at io.ktor.server.application.CreatePluginUtilsKt.createRouteScopedPluginInstance(CreatePluginUtils.kt:283)
	at io.ktor.server.application.CreatePluginUtilsKt.access$createRouteScopedPluginInstance(CreatePluginUtils.kt:1)
	at io.ktor.server.application.CreatePluginUtilsKt$createRouteScopedPlugin$1.install(CreatePluginUtils.kt:137)
	at io.ktor.server.application.CreatePluginUtilsKt$createRouteScopedPlugin$1.install(CreatePluginUtils.kt:123)
	at io.ktor.server.application.ApplicationPluginKt.install(ApplicationPlugin.kt:100)
	at com.re.ka.ku.plugins.SecurityKt.configureSecurity(Security.kt:11)