One or ore extensions are used by the project but are not installed for the platform used by the project :
ParticleSystem
This is error… how install extension? I choose “ParticleSystem” and restart software but get this error. 
Did you start out with a native project and then switch it to a web project?
No. Is this problem, need choose “Native platform” not “Web platform”? Thank you. 
Second question:
Is this BETA version? Because something went wrong everytime I work on Linux, first time tell me the software not launch in sudo(now nothing tell), have four time error, can’t normal learn this tutorial youtube.com/watch?v=jWSsJremc4I … 