There has been an error when initializing the PhysX SDK. There are several reasons why this could happen, for example not finding the system software, or two applications trying to grab the same hardware, or a version mismatch.
The error should have been reported on the console, somwhere ABOVE the assert. The output is category “error”, so if you don’t turn off every output manually then you will see it.
By the way: you need the SDK only if you want to compile yourself.
enn0x