Add this section to just above your dependencies
block.
Groovy/Gradle:
configurations.all {
resolutionStrategy {
force 'com.google.guava:guava:14.0.1'
force 'com.google.guava:guava-gwt:14.0.1'
}
}
Kotlin Script:
configurations.all {
resolutionStrategy {
force("com.google.guava:guava:14.0.1")
force("com.google.guava:guava-gwt:14.0.1")
}
}