Ionic "Invalid device state" Error with Xcode 7: Solved
November 17, 2015
I've been working on an Ionic Framework project for a while now. Just recently after I upgraded to Xcode 7, however, I couldn't get a project to install on the iOS simulator. Every time I would build an emulate the project, the process would fail with an "Invalid device state" error. I tried a number of things: rebooting my machine, reinstalling Xcode, etc. What I discovered, however, was the root of this problem had nothing to do with Xcode 7, but instead with file permissions.
Invalid Device State
Often when installing a node project using npm, our system may require use to use
sudo to execute the command without error. At some point, however, we may choose to use sudo when it isn't necessary. In the case of the "invalid device state" error, that's likely what's happened, especially if you are using
sudo to run the
ionic build ios and
ionic emulate ios commands. So, when is it appropriate to use
sudo when you are building an app with Ionic?
When to use sudo
If you look closely at the error produced when a build fails, you also see an error like this:
no such file or directory, stat '/Users/username/Library/Logs/CoreSimulator/D2FFF2E1-C3D2-4D1A-ABE2-242D3EAEDFC7/system.log'
This was a little odd to me. Even though it told me it didn't exist, I felt like the system really just couldn't see that system.log file. This is when I suspected a permissions problem.
When you use the Ionic Framework Getting Started Guide, you'll notice that node of the
ionic commands use
sudo. It is perfectly fine (and sometimes necessary) to use sudo with the npm commands, but don't use sudo on the ionic commands.
How to Fix
Here are the steps you can use to correct this issue:
- Empty the 'platforms' folder in your Ionic project
ionic platform add ios,
ionic build ios, and
ionic emulate ioswithout
- If you are on a Mac and are still getting a permissions error, make sure all the files in your user's home folder actually belong to that user by running
sudo chown -R username /Users/username
You should now be able to build, emulate, and launch your Ionic app without hitting that pesky "Invalid device state" error.