# Failed to building on Xcode **URL:** \ **Category:** Bug Reports\ **Created:** [February 26, 2016, 3:50am UTC](https://forums.fusetools.com/t/failed-to-building-on-xcode/3048 "2016-02-26T03:50:46Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![nickmick79](https://avatars.discourse-cdn.com/v4/letter/n/e9c0ed/32.png) [@nickmick79](https://forums.fusetools.com/u/nickmick79)\ **Post date:** [February 26, 2016, 3:50am UTC](https://forums.fusetools.com/t/failed-to-building-on-xcode/3048/1 "2016-02-26T03:50:46Z")
After downloading fuse, mono and my mac is up-to-date with the lastest software and everything. Now when i try to preview option from fuse, takes me to xcode. Then i connect my iphone 5s. I click run and i keep getting "Could not launch. Process Launch failed: security. " I click on the app it creates on my iphone and it says, “untrusted developer” Can allow using these apps in setting but i don’t know where or what to do to make it work. ---
**Author:** ![Anders\_Schau\_Knatten](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/anders_schau_knatten/32/41_2.png) [@Anders\_Schau\_Knatten](https://forums.fusetools.com/u/Anders_Schau_Knatten)\ **Post date:** [February 26, 2016, 9:02am UTC](https://forums.fusetools.com/t/failed-to-building-on-xcode/3048/2 "2016-02-26T09:02:04Z")
Hi, does this also happen if you try to make a full export of your app? `fuse build --target=ios --debug` or “Build with Fuse - iOS build and run” from Sublime. ---
**Author:** ![nickmick79](https://avatars.discourse-cdn.com/v4/letter/n/e9c0ed/32.png) [@nickmick79](https://forums.fusetools.com/u/nickmick79)\ **Post date:** [February 26, 2016, 5:43pm UTC](https://forums.fusetools.com/t/failed-to-building-on-xcode/3048/3 "2016-02-26T17:43:31Z")
The Errors are the same. The xcode can’t launch it because of security and the app created on my iphone doesn’t work because of its untrusted developer.