I've been using Appcelerator Studio a lot, never seen this problem before. I recently did a fresh installation of OS X, then installing Xcode (7.3.1) and Command Line Tools for Xcode 7.3.1.
When installing Appcelerator Studio (build: 4.5.0.201602170821) everything is going great, the CLI gets installed. When starting up Appcelerator Studio, I have to configure SDKs, hence I am only interested in iOS at the moment, I uncheck Android in the Platform Configuration. The following is that Configuring SDK encountered a problem:
An internal error occurred during: "Configuring SDK". java.lang.NullPointerException
I continuing, and go to Preferences>Studio>Platforms>iOS, where the iOS SDK home says Not specified, I click refresh - nothing happens.
I run xcode-select -p and the correct path to Xcode Developer folder is printed.
Anyone having a clue of solving this? I've check all the version statuses, also tried to reinstall and deleting all information that can impact to this.