# Build error "I/O error reading PNG header!"

**URL:** <https://forum.defold.com/t/build-error-i-o-error-reading-png-header/10687>\
**Category:** Bugs\
**Created:** [August 13, 2017, 10:43pm UTC](https://forum.defold.com/t/build-error-i-o-error-reading-png-header/10687 "2017-08-13T22:43:03Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![AGulev](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/agulev/32/4541_2.png) [@AGulev](https://forum.defold.com/u/AGulev)\
**Post date:** [August 14, 2017, 6:34am UTC](https://forum.defold.com/t/build-error-i-o-error-reading-png-header/10687/2 "2017-08-14T06:34:15Z")

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I had the same error with stickers

> [@Stickers for iMessage like a part an app](https://forum.defold.com/t/stickers-for-imessage-like-a-part-an-app/9646/12):
>
> Only one thing, i can’t set an icon. All time recieve an error: I/O error reading PNG header! iMessage App Icon27x20@2x.png /RedHood/content/external\_res/ios/PlugIns/StickerPackExtension.appex line 0 Problem and it do not depend on icon source. Any icons after packing into xcassets have this error when build app in defold without icons - all fine

As i understand xcode remove the headers of icons png.

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_[View the full topic](https://forum.defold.com/t/build-error-i-o-error-reading-png-header/10687)._