Xcode 6 Toolchain Build Error [duplicate] - ios

This question already has answers here:
Xcode 6 Beta Toolchain Error
(3 answers)
Closed 8 years ago.
I'm trying to make a Today Extension, so I opened up a new Xcode 6 project, and created a Today Extension. I then Built and Ran the project but it failed with this error:
Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-stdlib-tool failed with exit code 1
I literally didn't change anything, and I've only use Xcode for playground before now. How do I fix this??

This error message is very misleading. It happened to me when I am trying to run without proper certificate on a physical device. First check if you are getting the same error when trying to run on a simulator, if yes you need to dig deep, if not check your certificates.

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iOS 10.0.1 and Xcode Error: "Could not find developer disk image" [duplicate]

This question already has answers here:
"Could not find Developer Disk Image"
(9 answers)
Closed 6 years ago.
I updated to iOS 10.0.1 and cannot deploy my project to the device anymore. It was working right before the update. I believe my Xcode is updated (7.3.1).
Rebooting device and computer does not fix the issue.
Also interesting, in Xcode Settings -> iOS Deployment target -> iOS 9.3 is the higher version available!
Does anybody have a solution?
Your Xcode(7.3.1) is not updated. update your Xcode here.

App installation failed The application does not have a valid signature [duplicate]

This question already has answers here:
"The application does not have a valid signature" Xcode 4.3
(7 answers)
Closed 6 years ago.
When i run my app in IOS 9.3.2 it works fine.
But when i run same app on IOS 8.3 it gives following Error -
"App installation failed:- The application does not have a valid signature."
This happends only when I install Swift application. When i install Objective c App with same profile and Certificate, it works fine. I am using Developer Certificate and XCODE version is 7.3
If you are changing xcode to run in ios 8.3 then once clean the project and then try. sometime it works. If not using another xcode then also try after cleaning the project.
You can clean project by command + shift + k or from product select clean.
Update:
If you have folder references(If you have blue folders instead of yellow) then remove it and add everything in individual group.
For do that i advise to first make one copy of your project as backup and then do experiment.
If you have not much idea about folder reference and group then refer this link.
Hope this will help :)

Device not found message when run xcode app [duplicate]

This question already has answers here:
Invalid Device State - Xcode/iOS Simulator error
(13 answers)
Closed 6 years ago.
Device not found message when run xcode app
Xcode version : 7.3
os version : EI Capitanenter image description here
//i.stack.imgur.com/VbYIr.png
Just plug out your phone and plug in again and wait until it process the symbol files and start displaying in the simulator list.
Also clean your code once.
this issue generally occurs just because you update xcode or made some changes in application folder.
To fix this Quit xcode and restart again or Restart your Mac
Another solution is
Clean your Project and try to re run the project
Please restart your xcode and open again that project and run it.
Its work for me.
May be Its helpful to you
Clean Your Code. Then Build And Run.

Xcode 6 GM seed unable to boot ios simulator [duplicate]

This question already has answers here:
Unable to boot iOS 8 Simulator
(2 answers)
Closed 8 years ago.
I am trying to run my application with X-code 6 GM seed (Latest X-code version not beta) & IOS 8 simulator is not working every time it say 'unable to boot ios simulator'.
I already tried below given link solution but all goes vain
not works for me
Not works for me
Any one know else face this problem or have any solution then please let me know.
Thanks in advance
"unable to boot ios simulator" is a generic error for when the simulated runtime's bootstrap server (launchd_sim) does not respond within a certain time period. It usually responds in less than 1/100th of this time. This can occur if something is preventing launchd_sim from running. Check for crash logs in ~/Library/Logs/DiagnosticReports or /Library/Logs/DiagnosticReports
This is most often caused by the setting of DYLD_INSERT_LIBRARIES. Do you have DYLD_INSERT_LIBRARIES set? To find out, open Terminal.app and run 'echo $DYLD_INSERT_LIBRARIES'
dyld_sim will attempt to log that it is ignoring the library because it is a host dylib and not a simulator dylib. It uses logging routines provided by the host's dyld to do this, but on Mavericks, dyld has a bug and will crash. This is fixed in Yosemite's dyld.
Try unsetting DYLD_INSERT_LIBRARIES or upgrading to Yosemite if that is the case. If that is not the case, I'm curious what your crash logs reveal.

How to compile and run IOS app without using from command line tool without using code? [duplicate]

This question already has an answer here:
Build/run iOS Xcode project from Terminal
(1 answer)
Closed 8 years ago.
How to compile and run IOS app from command line tool without using code?
Note: Without using xcode
Check xcodebuild.
There are a lot of options though.
EDIT : You will indeed need to have Xcode installed anyway.

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