# Unable to build tool for Processing 4.0.1

**URL:** <https://discourse.processing.org/t/unable-to-build-tool-for-processing-4-0-1/38539>\
**Category:** Libraries\
**Created:** [August 29, 2022, 11:44am UTC](https://discourse.processing.org/t/unable-to-build-tool-for-processing-4-0-1/38539 "2022-08-29T11:44:19Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![quark](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/quark/32/26_2.png) [@quark](https://discourse.processing.org/u/quark)\
**Post date:** [August 29, 2022, 11:44am UTC](https://discourse.processing.org/t/unable-to-build-tool-for-processing-4-0-1/38539/1 "2022-08-29T11:44:20Z")

</div>

I am trying to build GUI Builder for Processing 4.0.1 using Eclipse.

With PS v3 this has never been a problem but now the pde is compiled to Java 11 (major version 55) so I get

```auto
import processing.app.Base;
    [javac] ^
    [javac] bad class file: /Users/peter/Documents/e-workspaces/quarks ws/lib4.0.1/pde.jar(processing/app/Base.class)
    [javac] class file has wrong version 55.0, should be 52.0
    [javac] Please remove or make sure it appears in the correct subdirectory of the classpath.

```

I have changed the project’s Java compliance to 11 but no matter what I do I can’t get past this point in the Ant build.