When Android Studio 2.1 preview 5 on ubuntu 14.04 cannot show the list of projects and cannot open any project, when you try to open it, it is displayed below.
An exception
Can not load Project: java.lang.illegalException:@NotNull method
Use the next step:
1. Disconnect Android Studio from the task manager
2. Clear the entire cache
3. Reboot the laptop
Go to file -> Invalid cache / reload
The studio will reboot after that, try loading the project
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