Could not find method mavenContent() for arguments - gradle

Question

I am trying to add a private nexus maven repo/utility to a gradle project (referred: https://docs.gradle.org/current/userguide/declaring_repositories.html#maven_repository_filtering).
Posting this issue as I haven't found any solution yet.
// Apply the java-library plugin to add support for Java Library
apply plugin: 'eclipse'
apply plugin: 'application'
apply plugin: 'spring-boot'
apply plugin: 'net.researchgate.release'
apply plugin: 'maven'
// Configure project-level settings.
project.ext {
mainClass = "${mainClass}"
configFile = "$rootProject.projectDir/src/resources/application.properties"
finalJarName = "${name}-${version}.jar"
javaVersion = '1.8'
springBootVersion = '1.3.4'
springBootActuatorClient = '1.5.3.RELEASE'
apacheCommonIOVersion = '2.5'
camelVersion = '2.17.2'
solrVersion = '5.4.0'
}
// JAR/FatJAR configuration
mainClassName = "${mainClass}"
// In this section you declare where to find the dependencies of your project
repositories {
// Use jcenter for resolving your dependencies.
// You can declare any Maven/Ivy/file repository here.
jcenter()
flatDir {
dirs 'lib'
}
maven {
url "http://nexus.repo.com/nexus/content/repositories/releases/"
credentials {
username = "${mavenUser}"
password = "${mavenPassword}"
}
mavenContent {
releasesOnly()
}
}
}
// Configure the build script.
buildscript {
ext {
springBootVersion = '1.3.6.RELEASE'
systemrulesVersion = '1.16.1'
}
repositories {
jcenter()
maven {
url "https://plugins.gradle.org/m2/"
}
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath 'net.researchgate:gradle-release:2.6.0'
}
}
dependencies {
........
compile group: 'com.some.utility.third-party-integrations', name: 'third-party-integrations', version: '1.0.29'
}
Firstly, the above implementation gives me error as,
Could not find method mavenContent() for arguments [build_6vwlfgalblecd5o2a6rgk023i$_run_closure1$_closure3$_closure6$_closure8#36b310aa] on org.gradle.api.internal.artifacts.repositories.DefaultMavenArtifactRepository_Decorated#10c2064a.
Secondly, if I remove that it generates an error for the dependency that I have added as below,
Could not resolve com.some.utility.third-party-integrations:third-party-integrations:1.0.29.
> inconsistent module metadata found. Descriptor: com.some.utility.third-party-integrations:third-party-integrations:1.0.0-SNAPSHOT Errors: bad version: expected='1.0.29' found='1.0.0-SNAPSHOT'