Missing configuration for LineWebhook plugin

[bjhham]

Exception in thread "main" java.lang.NullPointerException: Parameter specified as non-null is null: method io.github.cotrin8672.Configuration.setChannelSecret, parameter <set-?>
	at io.github.cotrin8672.Configuration.setChannelSecret(LineWebhookSignatureValidation.kt)
	at com.re.ka.ku.plugins.SecurityKt.configureSecurity$lambda$2$lambda$1$lambda$0(Security.kt:15)
	at io.ktor.server.application.CreatePluginUtilsKt.createRouteScopedPluginInstance(CreatePluginUtils.kt:283)
	at io.ktor.server.application.CreatePluginUtilsKt.access$createRouteScopedPluginInstance(CreatePluginUtils.kt:1)
	at io.ktor.server.application.CreatePluginUtilsKt$createRouteScopedPlugin$1.install(CreatePluginUtils.kt:137)