# Newbie mistake \> Designer Launcher

**URL:** <https://forum.inductiveautomation.com/t/newbie-mistake-designer-launcher/33629>\
**Category:** General Discussion\
**Tags:** perspective\
**Created:** [April 2, 2020, 3:25pm UTC](https://forum.inductiveautomation.com/t/newbie-mistake-designer-launcher/33629 "2020-04-02T15:25:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ecallaghan](https://avatars.discourse-cdn.com/v4/letter/e/f475e1/32.png) [@ecallaghan](https://forum.inductiveautomation.com/u/ecallaghan)\
**Post date:** [April 2, 2020, 3:25pm UTC](https://forum.inductiveautomation.com/t/newbie-mistake-designer-launcher/33629/1 "2020-04-02T15:25:27Z")

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Hello All,  
As in the subject, I’m very new to this application and am more of a visual business person who works in tech then I am technical.  
Can someone please tell me how to correct this problem when launching either an existing or create a new project in Designer? Btw, I’ve learned a lot since making this error.

**Error running property change script on session.custom.dashboard.objects.currentLastModified:**  
**Traceback (most recent call last):**  
**File “”, line w, in valueChanged**  
**AttributeError: ‘None Type’ object has no attribute ‘value’**

Also, is there a way to delete projects since at this time they are all learning exercises?

Thank you,  
Eileen

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**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [April 2, 2020, 3:54pm UTC](https://forum.inductiveautomation.com/t/newbie-mistake-designer-launcher/33629/2 "2020-04-02T15:54:13Z")

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You can delete projects from the web interface (localhost:8088, probably); go to Configure -\> Projects.

> [@ecallaghan](#):
>
> **File “”, line w, in valueChanged**  
> **AttributeError: ‘None Type’ object has no attribute ‘value’**

This _most likely_ means that you've got a script that's reading a tag. Tag reads return ['Qualified Value'](https://docs.inductiveautomation.com/display/DOC80/Q#qualifiedvalue) objects, which have individual `value`, `quality` and `timestamp` sub properties. However, if your tag read is trying to read a tag that _doesn't exist_, it will return `null` (in Python, represented by `None`/`NoneType`). This `null` value is _not_ a `QualifiedValue`, so trying to access the `.value` sub property fails and throws an error.

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**Author:** ![ecallaghan](https://avatars.discourse-cdn.com/v4/letter/e/f475e1/32.png) [@ecallaghan](https://forum.inductiveautomation.com/u/ecallaghan)\
**Post date:** [April 2, 2020, 5:34pm UTC](https://forum.inductiveautomation.com/t/newbie-mistake-designer-launcher/33629/3 "2020-04-02T17:34:07Z")

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Thank you!