Cannot add task ':jettyRun' as a task with that name already exists - spring-mvc

Question

I am using gretty as my container for building my spring project . But when i issue the command gradle clean or gradle jettyRun ,i am getting the following problem
Cannot add task ':jettyRun' as a task with that name already exists.
PFB my build.gradle file
apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'eclipse-wtp'
apply plugin: 'jetty' //too old, Jetty6, use gretty
apply plugin: 'org.akhikhl.gretty'
apply plugin: 'idea'
apply plugin: 'jacoco' //code coverage
def springVersion = "4.2.4.RELEASE"
def jdkVersion = 1.8
def junitVersion = "4.12"
def logbackVersion = "1.1.3"
def jclOverSlf4jVersion = "1.7.14"
def jstlVersion = "1.2"
def hamcrestVersion = "1.3"
def servletApiVersion = "3.1"
sourceCompatibility = jdkVersion
targetCompatibility = jdkVersion
repositories {
mavenLocal()
mavenCentral()
}
task wrapper(type: Wrapper) {
gradleVersion = '2.10'
}
configurations.all {
exclude group: "commons-logging", module: "commons-logging"
}
dependencies {
compile 'org.slf4j:jcl-over-slf4j:' + jclOverSlf4jVersion
compile 'ch.qos.logback:logback-classic:' + logbackVersion
compile 'org.springframework:spring-webmvc:' +springVersion
compile 'javax.servlet:jstl:' + jstlVersion
compile 'org.springframework:spring-test:' + springVersion
//exclude the build in hamcrest
testCompile('junit:junit:' + junitVersion) {
exclude group: 'org.hamcrest'
}
testCompile 'org.hamcrest:hamcrest-library:' + hamcrestVersion
//include in compile only, exclude in the war
providedCompile 'javax.servlet:javax.servlet-api:' + servletApiVersion
}
//Gretty
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'org.akhikhl.gretty:gretty:+'
}
}
gretty {
//port = 9000
contextPath = 'loanSharks'
servletContainer = 'jetty9'
}
//For Eclipse IDE only
eclipse {
wtp {
component {
//define context path, default to project folder name
contextPath = 'loanSharks'
}
}
}
jacoco {
toolVersion = "0.7.5+"
reportsDir = file("$buildDir/reports/jacoco")
}
jacocoTestReport {
reports {
xml.enabled = true
html.enabled = true
}
}

Answer 1

Even removes plugin: 'jetty', but I am being still with the error:
Execution failed for task ':jettyRun'.
Cannot call TaskInputs.property(String, Object) on task ':jettyRun' after task has started execution.