Gradle "could not resolve all dependecies"

I was opening a project last month and I came across this error in gradle when I was generating a jar … (I had already formatted the pc a few times)

In IntelliJ, build seems fine…

apply plugin: 'java'
apply plugin: 'application'

version '1.0.0'

sourceCompatibility = 1.8

repositories {

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'org.fusesource', name: 'sigar', version: '1.6.4'
    compile 'com.fasterxml.jackson.core:jackson-core:2.7.1'
    compile 'com.fasterxml.jackson.core:jackson-databind:2.7.1-1'
    testCompile group: '', name: 'http', version: '20070405'
    compile 'org.apache.httpcomponents:httpclient:4.5.5'
task uniqueJar(type: Jar) {
    manifest {
        attributes 'Implementation-Title':,
                'Implementation-Version': version,
                'Main-Class': ''

    baseName =
    doFirst {
        from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA'
    with jar

Any ideas? I had this error once, and it was because my JDK was installed wrong … now I removed the JDK and installed again (with purge and talz) and nothing …