# File system error (#0)

**URL:** <https://forum.xojo.com/t/file-system-error-0/63407>\
**Category:** macOS\
**Created:** [May 17, 2021, 9:39pm UTC](https://forum.xojo.com/t/file-system-error-0/63407 "2021-05-17T21:39:55Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![David\_Kaplan](https://forum.xojo.com/user_avatar/forum.xojo.com/david_kaplan/32/2686_2.png) [@David\_Kaplan](https://forum.xojo.com/u/David_Kaplan)\
**Post date:** [May 17, 2021, 9:39pm UTC](https://forum.xojo.com/t/file-system-error-0/63407/1 "2021-05-17T21:39:55Z")

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Using 2021 Release 1.1 on macOS Big Sur 11.3.1 on Intel.

The program runs fine when I choose “Run”, but I get an error on “Build”: Compilation of “MyProgram” failed. A file system error occurred (#0) for “MyProgram”. If the application already exists, please make sure that it is not currently running, otherwise please make sure that the destination directory is writable. I’m writing to a dropbox folder on my computer. I’m running Bitdefender anti-virus, but turned it off to test after this problem occurred. The program is not running.

Any thoughts?

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**Author:** ![Beatrix\_Willius](https://forum.xojo.com/user_avatar/forum.xojo.com/beatrix_willius/32/282_2.png) [@Beatrix\_Willius](https://forum.xojo.com/u/Beatrix_Willius)\
**Post date:** [May 18, 2021, 2:43am UTC](https://forum.xojo.com/t/file-system-error-0/63407/2 "2021-05-18T02:43:44Z")

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> [@David\_Kaplan](#):
>
> I’m writing to a dropbox folder on my computer

Don’t use Dropbox for your project.

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**Author:** ![Greg\_O\_Lone](https://forum.xojo.com/user_avatar/forum.xojo.com/greg_o_lone/32/49_2.png) [@Greg\_O\_Lone](https://forum.xojo.com/u/Greg_O_Lone)\
**Post date:** [May 18, 2021, 10:31am UTC](https://forum.xojo.com/t/file-system-error-0/63407/3 "2021-05-18T10:31:45Z")

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Right, don’t use Dropbox as the build destination. Dropbox locked files and folders while they are being transferred to their servers and prevents the IDE from writing the pieces it needs.

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**Author:** ![David\_Kaplan](https://forum.xojo.com/user_avatar/forum.xojo.com/david_kaplan/32/2686_2.png) [@David\_Kaplan](https://forum.xojo.com/u/David_Kaplan)\
**Post date:** [May 18, 2021, 3:51pm UTC](https://forum.xojo.com/t/file-system-error-0/63407/4 "2021-05-18T15:51:28Z")

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Thanks! That solved it, but this is a new problem. Don’t know if it’s a macOS upgrade or something else. I’ve been using Dropbox for several years now without a problem.

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**Author:** ![Greg\_O\_Lone](https://forum.xojo.com/user_avatar/forum.xojo.com/greg_o_lone/32/49_2.png) [@Greg\_O\_Lone](https://forum.xojo.com/u/Greg_O_Lone)\
**Post date:** [May 18, 2021, 6:00pm UTC](https://forum.xojo.com/t/file-system-error-0/63407/5 "2021-05-18T18:00:35Z")

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You’ve just been lucky.