# Outputs/Preview not coming through in Generative Design

**URL:** <https://forum.dynamobim.com/t/outputs-preview-not-coming-through-in-generative-design/50715>\
**Category:** Generative Design\
**Tags:** revit, dynamo\
**Created:** [May 16, 2020, 8:31am UTC](https://forum.dynamobim.com/t/outputs-preview-not-coming-through-in-generative-design/50715 "2020-05-16T08:31:25Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![fgandon](https://avatars.discourse-cdn.com/v4/letter/f/e495f1/32.png) [@fgandon](https://forum.dynamobim.com/u/fgandon)\
**Post date:** [July 9, 2021, 7:44am UTC](https://forum.dynamobim.com/t/outputs-preview-not-coming-through-in-generative-design/50715/21 "2021-07-09T07:44:50Z")

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Hi,

I am having the same error as Gavin: nothing to see in the preview. I was following the tutorial that he published on his youtube channel, and followed the same graph step by step except for few differences. I can not yet upload the graph or the dynamo log. Ill just copy the log below :  
**Dynamo log started 2021-07-09 07:39:12Z**  
**2021-07-09 07:39:12Z : Python template set to default.**  
**2021-07-09 07:39:13Z : Dynamo – Build 2.5.2.7915**  
**2021-07-09 07:39:13Z : Duplicate migration type registered for SunPathDirection**  
**2021-07-09 07:39:13Z : Dynamo will use the package manager server at : [https://www.dynamopackages.com](https://www.dynamopackages.com)**  
**2021-07-09 07:39:13Z : DynamoPackageManager (id: FCABC211-D56B-4109-AF18-F434DFE48139) extension is added**  
**2021-07-09 07:39:38Z : The folder ‘’ does not exist**

If you have any clues let me know! Many thanks

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**Author:** ![GavinNicholls](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/gavinnicholls/32/190442_2.png) [@GavinNicholls](https://forum.dynamobim.com/u/GavinNicholls)\
**Post date:** [July 11, 2021, 11:21pm UTC](https://forum.dynamobim.com/t/outputs-preview-not-coming-through-in-generative-design/50715/22 "2021-07-11T23:21:55Z")

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It appears there are some package conflicts, so I’d try uninstalling or removing packages temporarily and reintroducing them 1 or 2 at a time to see if one of them is the problem.

In my case the solution was a reinstall of the tool from the Autodesk app, and I had to get rid of some old packages.

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**Author:** ![fgandon](https://avatars.discourse-cdn.com/v4/letter/f/e495f1/32.png) [@fgandon](https://forum.dynamobim.com/u/fgandon)\
**Post date:** [July 12, 2021, 4:30am UTC](https://forum.dynamobim.com/t/outputs-preview-not-coming-through-in-generative-design/50715/23 "2021-07-12T04:30:58Z")

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Great thank you Gavin, I appreciate your reply and your tutorials on youtube! take care

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