Build error due to missing dependencies

[louis-hildebrand]

When I try to build the project, Gradle says two of the dependencies could not be found (com.takisoft.fix:preference-v7:26.0.1.0 and com.pavelsikun:vintage-chroma:1.5):

Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Could not resolve all task dependencies for configuration ':app:debugCompileClasspath'.
   > Could not find com.takisoft.fix:preference-v7:26.0.1.0.
     Required by:
         project :app
   > Could not find com.pavelsikun:vintage-chroma:1.5.
     Required by:
         project :app

Possible solution:
 - Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

• According to https://mvnrepository.com/artifact/com.pavelsikun/vintage-chroma/1.5, the vintage-chroma dependency is hosted at https://repo.spring.io/libs-milestone/, but I get HTTP 401 if I try to download from there.
• According to https://mvnrepository.com/artifact/com.takisoft.fix/preference-v7/26.1.0.1, the preference-v7 dependency is in JCenter, but Gradle isn't finding it there. If I visit https://jcenter.bintray.com, it redirects to https://repo1.maven.org/maven2/, which does not seem to have the dependencies.

Any idea where I can get these dependencies?