# IO Exception Error when building Mac Screensaver

**URL:** <https://forum.iscreensaver.com/t/io-exception-error-when-building-mac-screensaver/677>\
**Category:** macOS\
**Created:** [October 12, 2022, 11:38am UTC](https://forum.iscreensaver.com/t/io-exception-error-when-building-mac-screensaver/677 "2022-10-12T11:38:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![aitch](https://forum.iscreensaver.com/letter_avatar_proxy/v4/letter/a/dbc845/32.png) [@aitch](https://forum.iscreensaver.com/u/aitch)\
**Post date:** [October 12, 2022, 11:38am UTC](https://forum.iscreensaver.com/t/io-exception-error-when-building-mac-screensaver/677/1 "2022-10-12T11:38:53Z")

</div>

I am wanting to try out the software to build a simple screensaver using static images and nothing else.  
When I hit the Build button I get the following error in the iscreensaver Designer Log:

`Utils.WriteBinaryStringToFile IOException 104 : IOException`

Please can you advise how to resolve?

Many thanks

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<div class="post-metadata">

**Author:** ![iScreensaver](https://forum.iscreensaver.com/user_avatar/forum.iscreensaver.com/iscreensaver/32/24_2.png) [@iScreensaver](https://forum.iscreensaver.com/u/iScreensaver)\
**Post date:** [October 12, 2022, 2:20pm UTC](https://forum.iscreensaver.com/t/io-exception-error-when-building-mac-screensaver/677/2 "2022-10-12T14:20:55Z")

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Welcome to the community!

The 104 error is usually caused by something preventing the output file to be written. Are you doing any of the following?

1. running antivirus software
2. trying to build on a network server, shared folder (such as DropBox, iCloud Drive, etc.)

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<div class="post-metadata">

**Author:** ![iScreensaver](https://forum.iscreensaver.com/user_avatar/forum.iscreensaver.com/iscreensaver/32/24_2.png) [@iScreensaver](https://forum.iscreensaver.com/u/iScreensaver)\
**Post date:** [November 2, 2023, 3:02pm UTC](https://forum.iscreensaver.com/t/io-exception-error-when-building-mac-screensaver/677/3 "2023-11-02T15:02:38Z")

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More tips:

- disable your anti-virus software (such as CrowdStrike) or set up an Exception for `iScreensaver Designer.app`
- if you are using iCloud Drive, you can rename the iScreensaver project folder to end in `.nosync` which will prevent iCloud from synchronizing the folder
- if you are on Sonoma 14.0, please upgrade to Sonoma 14.1 which addresses some of these issues.

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<div class="post-metadata">

**Author:** ![iScreensaver](https://forum.iscreensaver.com/user_avatar/forum.iscreensaver.com/iscreensaver/32/24_2.png) [@iScreensaver](https://forum.iscreensaver.com/u/iScreensaver)\
**Post date:** [November 3, 2023, 4:59pm UTC](https://forum.iscreensaver.com/t/io-exception-error-when-building-mac-screensaver/677/4 "2023-11-03T16:59:32Z")

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If you are adding specific exceptions for `iScreensaver Designer.app` to your antivirus software, please take note:

During build, iScreensaver builds to a temporary folder, and then copies the built installer app to the destination folder (the `/Installers/mac` or `/Installer/win` folders which are located next to the ISC project file.

On macOS the temp folder has a long random name.  
If you look at the build details, you will see the folder listed toward the end. It will look like this:

```auto
----------------------------------------
Adding Module JSON
----------------------------------------
----------------------------------------
Saving Archive
Saving Copy to : /private/var/folders/1w/bjsh07hj1g3_7x6x4m064ryw0000gq/T/TemporaryItems/iScreensaver Temp/Temp-77300306/Install SpaceDemo Saver.app/Contents/Resources/Archive/Archive.isc

```

An easy way to find this temporary folder is to use the Terminal and type this command:

> open “$TMPDIR/TemporaryItems/iScreensaver Temp”

Which will open the folder in the Finder.

Then you can add this folder to your antivirus exceptions list.