During testing for the 2020 season, we found that there is a bug in the 2019 VS Code plugins that cause the Check For Online WPILib Updates functionality to see 2020 beta builds as valid for 2019. They are not, and this will cause your build to fail. The latest version of GradleRIO for 2019 will always be
2019.4.1, so if you need to update, for instance if you have an old project, its easy to do so manually. In the build.gradle file, all that would need to be updated is the GradleRIO version at the top of the file.
We might be pushing a patched 2019 plugin to the VS Code Marketplace, we are looking into it, but for now just don’t run the update functionality, and instead do so manually.