I'm getting following error inconsistently with kt...

# ktor

[Leon K]

I'm getting following error inconsistently with ktor-client (CIO):

java.security.KeyStoreException: problem accessing trust <http://storejava.io|storejava.io>.IOException: Invalid keystore format
        at sun.security.ssl.TrustManagerFactoryImpl.engineInit(TrustManagerFactoryImpl.java:74)
        at <http://javax.net|javax.net>.ssl.TrustManagerFactory.init(TrustManagerFactory.java:250)
        at io.ktor.network.tls.TLSConfigBuilderKt.findTrustManager(TLSConfigBuilder.kt:114)
        at io.ktor.network.tls.TLSConfigBuilderKt.access$findTrustManager(TLSConfigBuilder.kt:1)
        at io.ktor.network.tls.TLSConfigBuilder.build(TLSConfigBuilder.kt:58)
        at io.ktor.network.tls.TLSKt.tls(TLS.kt:51)
        at io.ktor.client.engine.cio.Endpoint.connect(Endpoint.kt:180)
        at io.ktor.client.engine.cio.Endpoint$connect$1.invokeSuspend(Endpoint.kt)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:32)
        at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:113)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:561)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:727)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:667)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:655)

This appears inconsistently. Any ideas what causes this / how to fix it?