Gradle+AspectJ Could not find method aspectj() for arguments "'aspectj' cannot be applied to '(?, java.lang.String, ?, ?)'"

I've added following task in gradles's rootProject build.gradle file as below. I'm planning to weave AspectJ to compiled classes.

plugins {
        id "io.freefair.aspectj.post-compile-weaving" version "5.1.1"
    }

configurations {
    ajc
    aspects
    compile {
        extendsFrom aspects
    }
}

ext {
    aspectjVersion = '1.9.2'
}

dependencies {
    implementation gradleApi() // for custom gradle task/pugin development

    compile project('my-project')
    compile project('my-project1')
    compile project('my-project2')
    // ...

    ajc "org.aspectj:aspectjtools:1.9.2"
    aspects project('my-project')
    aspects project('my-project1')
    // ...
}

compileJava {
    doLast {
        aspectj project.sourceSets.main.output.classesDirs.getAsPath(),
                configurations.aspects.asPath,
                project.sourceSets.main.output.classesDirs.getAsPath(),
                project.sourceSets.main.runtimeClasspath.asPath
    }
}

def aspectj = { destDir, aspectPath, inpath, classpath ->
    ant.taskdef(resource: "org/aspectj/tools/ant/taskdefs/aspectjTaskdefs.properties",
            classpath: configurations.ajc.asPath)

    ant.iajc(
            maxmem: "1024m", fork: "true", Xlint: "ignore",
            destDir: destDir,
            aspectPath: aspectPath,
            inpath: inpath,
            classpath: classpath,
            source: project.sourceCompatibility,
            target: project.targetCompatibility
    )
}

But, I am getting an error Could not find method aspectj() for arguments. What am I missing here?

* What went wrong:
Execution failed for task ':compileJava'.
> Could not find method aspectj() for arguments [/Users/my-project/build/classes/java/main, 

/Users//my-project/lib/lib-jars/httpcomponents-client-4.5.11/httpclient-4.5.11.jar:/Users//my-project/lib/lib-jars/aws/aws-sdk-modules-2.0.jar,:/... 

/Users//my-project/build/classes/java/main, 

/Users//my-project/my-sub-project/build/libs/my-sub-project-8.2.jar:/Users//.gradle/caches/modules-2/files-2.1/org.aspectj/aspectjrt/1.9.6/1651849d48659e5703adc2599e694bf67b8c3fc4/aspectjrt-1.9.6.jar,:/...]

Gradle Version Details are as below:

------------------------------------------------------------
Gradle 6.6
------------------------------------------------------------

Build time:   2020-08-10 22:06:19 UTC
Revision:     d119144684a0c301aea027b79857815659e431b9

Kotlin:       1.3.72
Groovy:       2.5.12
Ant:          Apache Ant(TM) version 1.10.8 compiled on May 10 2020
JVM:          1.8.0_152 (Oracle Corporation 25.152-b16)
OS:           Mac OS X 10.15.6 x86_64

Here is pice of code helped me to get rid of this issue.

def aspectj = {

ant.taskdef(resource:"org/aspectj/tools/ant/taskdefs/aspectjTaskdefs.properties", classpath: configurations.ajc.asPath)

ant.iajc(
        maxmem: "1024m", fork: "true", Xlint: "ignore",
        destDir: sourceSets.main.output.classesDirs.asPath,
        aspectPath: configurations.aspects.asPath,
        sourceRootCopyFilter: "**/*.java",
        classpath: configurations.compile.asPath,
        source: project.sourceCompatibility,
        target: project.targetCompatibility
      ){
         sourceroots{
            sourceSets.main.java.srcDirs.each{
               if(!it.absolutePath.contains("/src/main/java")) {
                    pathelement(location: it.absolutePath)
                }
            }
         }
    }
 }