# Error when publish app

**URL:** <https://forum.flowable.org/t/error-when-publish-app/5410>\
**Category:** Uncategorized\
**Created:** [February 10, 2020, 11:23am UTC](https://forum.flowable.org/t/error-when-publish-app/5410 "2020-02-10T11:23:07Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Hengky](https://avatars.discourse-cdn.com/v4/letter/h/858c86/32.png) [@Hengky](https://forum.flowable.org/u/Hengky)\
**Post date:** [February 12, 2020, 10:14pm UTC](https://forum.flowable.org/t/error-when-publish-app/5410/9 "2020-02-12T22:14:41Z")

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I just follow these two links below.

> [@How to extend Flowable to add "Business Domain" specific BPMN elements](https://forum.flowable.org/t/how-to-extend-flowable-to-add-business-domain-specific-bpmn-elements/679/5):
>
> Another example (buried in tons of another functionality) is in the PR modified stencilset: changed converter: Regards Martin

> [@Java Service Task in Designer / Modeler](https://forum.flowable.org/t/java-service-task-in-designer-modeler/1671/19):
>
> I don’t think is possible to externalize a custom task into a separate JAR, because you need to modify several flowable-modules (listed in this post: [How to extend Flowable to add "Business Domain" specific BPMN elements](https://forum.flowable.org/t/how-to-extend-flowable-to-add-business-domain-specific-bpmn-elements/679/6)) to make it work.

Thanks.

Hengky

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