Vratme se v původnímu dotazu
Podle tohoto https://www.youtube.com/watch?v=UKXPXT7i2Kc jsem naprogramoval tuto aplikaci a ta mě vyhazuje toto

Caused by: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all artifacts for configuration ':classpath'.

org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all artifacts for configuration ':classpath'.
org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21.
org.gradle.api.resources.ResourceException: Could not get resource 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.3.21/kotlin-stdlib-jdk8-1.3.21.pom'.
org.gradle.internal.resource.transport.http.HttpRequestException: Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.3.21/kotlin-stdlib-jdk8-1.3.21.pom'.
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target