Simulator won't boot on macOs Mojave

Hello there,

My problem is simple:

I've installed Eclipse, the connectiq SDK (3.0.12) and try to create and Simple Data Field app. It compiles and the simulator boot but then the device screen stays black with a blue triangle.
So I've opened a sample project (SimpleDataField) and build it to a Simulator and, again, the device screen stays black with a blue triangle

PS : here is what the simulator looks

Thanks in advance for your help