[AdvancedStateAndSideEffectsCodelab] Build failed

[fornewid]

Today, the following error occurs.

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':buildSrc'.
> Could not resolve all files for configuration ':buildSrc:classpath'.
   > Could not download kotlin-sam-with-receiver-1.6.21.jar (org.jetbrains.kotlin:kotlin-sam-with-receiver:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-sam-with-receiver/1.6.21/kotlin-sam-with-receiver-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-sam-with-receiver/1.6.21/kotlin-sam-with-receiver-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-gradle-plugin-api-1.6.21.jar (org.jetbrains.kotlin:kotlin-gradle-plugin-api:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-gradle-plugin-api/1.6.21/kotlin-gradle-plugin-api-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-gradle-plugin-api/1.6.21/kotlin-gradle-plugin-api-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-gradle-plugin-model-1.6.21.jar (org.jetbrains.kotlin:kotlin-gradle-plugin-model:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-gradle-plugin-model/1.6.21/kotlin-gradle-plugin-model-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-gradle-plugin-model/1.6.21/kotlin-gradle-plugin-model-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-util-klib-1.6.21.jar (org.jetbrains.kotlin:kotlin-util-klib:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-util-klib/1.6.21/kotlin-util-klib-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-util-klib/1.6.21/kotlin-util-klib-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-klib-commonizer-api-1.6.21.jar (org.jetbrains.kotlin:kotlin-klib-commonizer-api:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-klib-commonizer-api/1.6.21/kotlin-klib-commonizer-api-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-klib-commonizer-api/1.6.21/kotlin-klib-commonizer-api-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-tooling-metadata-1.6.21.jar (org.jetbrains.kotlin:kotlin-tooling-metadata:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-tooling-metadata/1.6.21/kotlin-tooling-metadata-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-tooling-metadata/1.6.21/kotlin-tooling-metadata-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-project-model-1.6.21.jar (org.jetbrains.kotlin:kotlin-project-model:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-project-model/1.6.21/kotlin-project-model-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-project-model/1.6.21/kotlin-project-model-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-annotation-processing-gradle-1.6.21.jar (org.jetbrains.kotlin:kotlin-annotation-processing-gradle:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-annotation-processing-gradle/1.6.21/kotlin-annotation-processing-gradle-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-annotation-processing-gradle/1.6.21/kotlin-annotation-processing-gradle-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-android-extensions-1.6.21.jar (org.jetbrains.kotlin:kotlin-android-extensions:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-android-extensions/1.6.21/kotlin-android-extensions-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-android-extensions/1.6.21/kotlin-android-extensions-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-compiler-runner-1.6.21.jar (org.jetbrains.kotlin:kotlin-compiler-runner:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-compiler-runner/1.6.21/kotlin-compiler-runner-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-compiler-runner/1.6.21/kotlin-compiler-runner-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-compiler-embeddable-1.6.21.jar (org.jetbrains.kotlin:kotlin-compiler-embeddable:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-compiler-embeddable/1.6.21/kotlin-compiler-embeddable-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-compiler-embeddable/1.6.21/kotlin-compiler-embeddable-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-scripting-compiler-embeddable-1.6.21.jar (org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-scripting-compiler-embeddable/1.6.21/kotlin-scripting-compiler-embeddable-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-scripting-compiler-embeddable/1.6.21/kotlin-scripting-compiler-embeddable-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-scripting-compiler-impl-embeddable-1.6.21.jar (org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-scripting-compiler-impl-embeddable/1.6.21/kotlin-scripting-compiler-impl-embeddable-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-scripting-compiler-impl-embeddable/1.6.21/kotlin-scripting-compiler-impl-embeddable-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-native-utils-1.6.21.jar (org.jetbrains.kotlin:kotlin-native-utils:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-native-utils/1.6.21/kotlin-native-utils-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-native-utils/1.6.21/kotlin-native-utils-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-util-io-1.6.21.jar (org.jetbrains.kotlin:kotlin-util-io:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-util-io/1.6.21/kotlin-util-io-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-util-io/1.6.21/kotlin-util-io-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-daemon-embeddable-1.6.21.jar (org.jetbrains.kotlin:kotlin-daemon-embeddable:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-daemon-embeddable/1.6.21/kotlin-daemon-embeddable-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-daemon-embeddable/1.6.21/kotlin-daemon-embeddable-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-build-common-1.6.21.jar (org.jetbrains.kotlin:kotlin-build-common:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-build-common/1.6.21/kotlin-build-common-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-build-common/1.6.21/kotlin-build-common-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-daemon-client-1.6.21.jar (org.jetbrains.kotlin:kotlin-daemon-client:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-daemon-client/1.6.21/kotlin-daemon-client-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-daemon-client/1.6.21/kotlin-daemon-client-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-scripting-jvm-1.6.21.jar (org.jetbrains.kotlin:kotlin-scripting-jvm:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-scripting-jvm/1.6.21/kotlin-scripting-jvm-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-scripting-jvm/1.6.21/kotlin-scripting-jvm-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
   > Could not download kotlin-scripting-common-1.6.21.jar (org.jetbrains.kotlin:kotlin-scripting-common:1.6.21)
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-scripting-common/1.6.21/kotlin-scripting-common-1.6.21.jar'.
         > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-scripting-common/1.6.21/kotlin-scripting-common-1.6.21.jar'.
            > PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed

[fornewid]

I can't reproduce right now.
Sorry. It doesn't seem to be a problem with the project.