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Hello everyone, I'm trying to publish a multiplatform project to Maven. I've copied Ktor .gradle files, but when I try to run the `publishToMavenLocal` task I get the following error:

```
* Where:
Script 'D:\Coding\Borsellino\gradle\publish.gradle' line: 45

* What went wrong:
Could not evaluate onlyIf predicate for task ':borsellino-eth:publishKotlinMultiplatformPublicationToMavenLocal'.
&gt; Cannot get property 'isLinuxHost' on extra properties extension as it does not exist
```

I've made sure that I applied the `publish.gradle` file properly inside my project `build.gradle` file as follows:

```
if (!rootProject.ext.skipPublish.contains(project.name)) {
    apply from: rootProject.file('gradle/publish.gradle')
}
```

Where should I look to check I got everything properly set up?

Hi <@UD2QA0TCL>, ktor have to be backward compatible and publish with a lot of tweaks.

Consider using the manual: <https://kotlinlang.org/docs/tutorials/multiplatform-library.html>

<@U4CP1J0QP> Tahnk you very much, I will look at it right now!

<@U4CP1J0QP> Can I take this question into a DM? I would like some more in depth explanation of some things you do inside Ktor