# Error: 'Could not generate CMMN model'

**URL:** <https://forum.flowable.org/t/error-could-not-generate-cmmn-model/2672>\
**Category:** Flowable Application\
**Created:** [October 3, 2018, 2:08pm UTC](https://forum.flowable.org/t/error-could-not-generate-cmmn-model/2672 "2018-10-03T14:08:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Nielsdb](https://avatars.discourse-cdn.com/v4/letter/n/3da27b/32.png) [@Nielsdb](https://forum.flowable.org/u/Nielsdb)\
**Post date:** [October 3, 2018, 2:08pm UTC](https://forum.flowable.org/t/error-could-not-generate-cmmn-model/2672/1 "2018-10-03T14:08:43Z")

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Hi,

As a try-out I have worked on a small model in Flowable modeler to create a case model. I have validated the model and checked it again whether I have everything in place. Nothing seems to be wrong in the model itself. Nor have I tried anything with custom coding so that should not be the problem. At least, I hope it is not the model.

I cannot export the model, if I try this, I get the error:  
This site is not accessible  
The web page at http: // localhost: 8080 / flowable-modeller / app / rest / models / fd08b5f4-c567-11e8-9394-7e7a914df67a / cmmn? Version = 1538575557797 may have been temporarily disabled or permanently moved to a new web address.  
ERR\_INVALID\_RESPONSE

Anyway, when I try to define the app so I can start a process in the flowable-task workflow, it gives me the error ‘Could not generate CMMN model’.

Does anyone have a solution for this, or know where the problem is?

Thanks in advance