# Error starting new process instance (HTTP 500)

**URL:** <https://forum.flowable.org/t/error-starting-new-process-instance-http-500/1956>\
**Category:** Flowable Engine\
**Created:** [April 28, 2018, 5:37pm UTC](https://forum.flowable.org/t/error-starting-new-process-instance-http-500/1956 "2018-04-28T17:37:02Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Heurazio](https://avatars.discourse-cdn.com/v4/letter/h/67e7ee/32.png) [@Heurazio](https://forum.flowable.org/u/Heurazio)\
**Post date:** [May 3, 2018, 7:00pm UTC](https://forum.flowable.org/t/error-starting-new-process-instance-http-500/1956/5 "2018-05-03T19:00:10Z")

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> [@joram](#):
>
> Can you paste the http task xml?

Please have a look at the process definition above (It’s a summary section - click to expand).

> [@martin.grofcik](#):
>
> did you try to start process instance from flowable-task app (it should use the same API).

Had the time to try it. It’s not working too.

**Solution**  
The error relates to wrong URL encoding (linked [topic](https://forum.flowable.org/t/http-task-url-encoding/1982))

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