# Is it possible to fix definition error in runtime service

**URL:** <https://forum.flowable.org/t/is-it-possible-to-fix-definition-error-in-runtime-service/9816>\
**Category:** Flowable Engine\
**Created:** [October 13, 2022, 9:41am UTC](https://forum.flowable.org/t/is-it-possible-to-fix-definition-error-in-runtime-service/9816 "2022-10-13T09:41:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nealsun](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/nealsun/32/2905_2.png) [@nealsun](https://forum.flowable.org/u/nealsun)\
**Post date:** [October 13, 2022, 9:41am UTC](https://forum.flowable.org/t/is-it-possible-to-fix-definition-error-in-runtime-service/9816/1 "2022-10-13T09:41:00Z")

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if i deploy a process definition, and it may has errors in definition(e.g. wrong expression). now I start this process, and can not finish this flow because of definition errors, so is it possible to fix in runtime execution?

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**Author:** ![martin.grofcik](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/martin.grofcik/32/71_2.png) [@martin.grofcik](https://forum.flowable.org/u/martin.grofcik)\
**Post date:** [October 14, 2022, 9:07am UTC](https://forum.flowable.org/t/is-it-possible-to-fix-definition-error-in-runtime-service/9816/2 "2022-10-14T09:07:15Z")

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Try to migrate process instance to fixed process definition.

> **[Process Instance Migration · Flowable Open Source Documentation](https://www.flowable.com/open-source/docs/bpmn/ch09-ProcessInstanceMigration/#docsNav)**
>
> When process definitions are updated with new versions, the question arises what should be done with already running process instances that are using older versions of the process definition.

Regards  
Martin