"The file "MyApp.app" couldn't be opened because you don't have permission to view it" when running app in Xcode 6 Beta 4

That's because you may using the repository cloned from the git or svn. Try to clone another new version and run it.

I got same error on my **Xcode 6.1.1** for a project downloaded from gitHub which was committed 4 years ago.
For me, setting **Architectures** to the default value **Standard architectures(armv7,arm64)** and **Compiler for C/C++/Objective-C** to Default Compiler in **Building Settings** worked.

I had similar issue (xCode 6.2) for sample code downloaded. I tried to set `Executable Name` to `Default in Info.plist` but this didn't worked.

Instead change **Compiler for C/C++/Objective-C** to **Default compiler (Apple LLVM 6.0)** instead of *Unsupported Compiler(com.apple.compilers.llvmgcc42)* for project.

![Screenshot][1]


[1]:

Check permissions to read+write for project folder (Right Click for project folder in Finder > Get Info)

I've had this error with a number of my older projects that I am getting out of the cupboard to update. It seems that using Xcode 6 with older code seems to bring this about for some reason.

I have fixed this in all projects that I have done this with by:

1. Delete **Derived Data**
2. in **Product: do a clean**
3. go to Build Settings in the project Target and go to Build Options and change the value of the "Compiler for C/C++/Objective-C" to '**Default
Compiler**'.

In my case it helped just to close Xcode, repaired the permissions with the Disk Utility. Only after a **reboot** it worked like a charm.

with X-code 6.3.2

[Build Settings] Options.
[All]-[Build Options]-[Compiler for C/C++/Objective-C]-[Default compiler (Apple LLVM 6.1)]

Then rebuild the project, and it runs ok.

Don't know if the problem is related but maybe it can be a solution for anyone pulling the hairs like me.

In my case, I have a project with a lot of targets. Each target is a customisation of that base project which is a `Cocoa Touch Static Library` and the targets, `Applications`. Even if the `main` file is added into the library compilation, but not in each target, that error message appears. So what I did? Manually added the `main` file to each target in the `Compile Sources` section and bingo, all fine.

As i have also faced this issue today morning and none of the answers helped me out particularly in my case. And after trying for hours i figured out the issue.

Actually while working in storyboard by mistake, i just renamed my "**Main.storyboard**" to "**.storyboard**" and changing it back to "**Main.storyboard**" solved my issue.

**SOLUTION(As per my issue)**: May be you have renamed any file due to which xcode couldn't load it and raised an issue.
For example: as mentioned above the case of changing "**Executable File**" name
**Possible Issue area:** May be the last few files you were working in.

For me, a simple **Product -> Clean** worked great