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are you seeing this in your config-cache html file? Also sometimes, I see more errors in a build-scan.

is this an ad-hoc task that has `doFirst` or `doLast` blocks? I think the most likely case is that one of those is capturing the build script reference. but you should provide more details on how the task is created.

It's part of doLast doFirst, I have figured out that with build scan I get more info :slightly_smiling_face:.

```val version = project.version
val staticResourceDirectory = project.fileTree("$buildDir/resources/main/static/")
tasks.processResources.configure {
    inputs.property("projectVersion", version)
    outputs.cacheIf { true }
    doLast {
        staticResourceDirectory.forEach {
            postProcessApiFile(it)
        }
    }
}```


if `postProcessApiFile` is a function defined locally, yes it's forbidden

```val version = project.version
val staticResourceDirectory = project.fileTree("$buildDir/resources/main/static/").asFileTree
tasks.processResources.configure {
    inputs.property("projectVersion", version)
    outputs.cacheIf { true }
    doLast {
        staticResourceDirectory.forEach {
            //postProcessApiFile(it, version as String)
        }
    }
}```


Even this does not work :slightly_smiling_face: .

```staticResourceDirectory```
 is the issue.

It is of type FileTree but it seems to be forbidden, commenting this reference removes the warning