# Processing 3.5.4 p5js error

**URL:** <https://discourse.processing.org/t/processing-3-5-4-p5js-error/17351>\
**Category:** Processing\
**Created:** [January 26, 2020, 3:39pm UTC](https://discourse.processing.org/t/processing-3-5-4-p5js-error/17351 "2020-01-26T15:39:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![marzinp](https://avatars.discourse-cdn.com/v4/letter/m/ed8c4c/32.png) [@marzinp](https://discourse.processing.org/u/marzinp)\
**Post date:** [January 26, 2020, 3:39pm UTC](https://discourse.processing.org/t/processing-3-5-4-p5js-error/17351/1 "2020-01-26T15:39:56Z")

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Hi, since I installed Processing 3.5.4 and updated p5js mode,  
I can’t load any p5js sketch.  
Error: “Failed to open [http://127.0.0.1:8524](http://127.0.0.1:8524) Aucune application n’est associée au fichier spécifié pour cette opération.”  
Processing 3.5.3 is running fine.  
I’m on Windows 10, and disabled antivirus and firewalls, with no success.

Thanks for your help

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**Author:** ![kll](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kll/32/964_2.png) [@kll](https://discourse.processing.org/u/kll)\
**Post date:** [January 27, 2020, 1:55am UTC](https://discourse.processing.org/t/processing-3-5-4-p5js-error/17351/2 "2020-01-27T01:55:25Z")

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also use 3.5.4 on win10  
and now test p5.js mode, load a example, works fine here.  
but i did NOT have to ?UPDATE? mode, here still

```auto
p5.js Mode 1.2.2 Fathom Information Design Adds a simple editor for p5.js code

```

* * *

anyhow when i try first time to run i got the windows defender java question

 ![processing354_p5jemode](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/5/58b8d71bde9b0fb3dfd5c05cd7a48b984ca12a00.png)

what is actually strange as i use PDE 3.5.4 in JAVA mode a week already?

 ![processing354_p5jemode_3D](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/1/1239868ed906ef050a07be52ee51dce366fc17c5.png)

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<div class="post-metadata">

**Author:** ![marzinp](https://avatars.discourse-cdn.com/v4/letter/m/ed8c4c/32.png) [@marzinp](https://discourse.processing.org/u/marzinp)\
**Post date:** [February 25, 2020, 7:52am UTC](https://discourse.processing.org/t/processing-3-5-4-p5js-error/17351/3 "2020-02-25T07:52:55Z")

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My problem is solved, I was running this new version in a sandbox…