Gradle 4 exception

build.gradle

//empty file

gradle.properties

artifactory_user=tang
artifactory_password=*secret*key*
artifactory_contextUrl=http://artifactory.tang.local:8081/artifactory

output.log

> gradle --version

------------------------------------------------------------
Gradle 4.1
------------------------------------------------------------

Build time:   2017-08-07 14:38:48 UTC
Revision:     941559e020f6c357ebb08d5c67acdb858a3defc2

Groovy:       2.4.11
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_121 (Oracle Corporation 25.121-b13)
OS:           Mac OS X 10.12.6 x86_64

> gradle

FAILURE: Build failed with an exception.

* Where:
Settings file '/Users/krachynski/projects/tmp/gradle/settings.gradle' line: 1

* What went wrong:
A problem occurred evaluating settings 'gradle'.
> Could not find method pluginRepositories() for arguments [settings_b62d425u9mi1ys2wqbqmtg11z$_run_closure1@19ec1146] on settings 'gradle' of type org.gradle.initialization.DefaultSettings.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s
> ./gradlew --version                                                 1

------------------------------------------------------------
Gradle 3.4.1
------------------------------------------------------------

Build time:   2017-03-03 19:45:41 UTC
Revision:     9eb76efdd3d034dc506c719dac2955efb5ff9a93

Groovy:       2.4.7
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_121 (Oracle Corporation 25.121-b13)
OS:           Mac OS X 10.12.6 x86_64

> ./gradlew
:help

Welcome to Gradle 3.4.1.

To run a build, run gradlew <task> ...

To see a list of available tasks, run gradlew tasks

To see a list of command-line options, run gradlew --help

To see more detail about a task, run gradlew help --task <task>

BUILD SUCCESSFUL

Total time: 0.839 secs

settings.gradle

pluginRepositories {
    maven {
        url "${artifactory_contextUrl}/plugins-snapshot"
    }
    gradlePluginPortal()
}