Build failure could not resolve dependencies

[almudenaris]

Today the plugin has started to failed, I get the next error message:

FAILURE: Build failed with an exception.

• What went wrong:
  A problem occurred configuring root project 'relevanteapp'.

  Could not resolve all dependencies for configuration ':classpath'.
  Could not resolve com.sahlbach.gradle:gradle-jetty-eclipse-plugin:1.9.+.
  Required by:

  Failed to list versions for com.sahlbach.gradle:gradle-jetty-eclipse-plugin.
  > Unable to load Maven meta-data from https://jcenter.bintray.com/com/sahlbach/gradle/gradle-jetty-eclipse-plugin/maven-metadata.xml.
  > Could not GET 'https://jcenter.bintray.com/com/sahlbach/gradle/gradle-jetty-eclipse-plugin/maven-metadata.xml'.
  > peer not authenticated