Cannot run fluid demos

For some reason, I cannot run most of playgrounds from the Fluid Rendering Demos

For example, when I attempt to run an example of a custom particle system rendered as a fluid,

I am getting the following error

Type ‘AbstractEngine’ is missing the following properties from the type Engine: customAnimationFrameRequester,…

Please let me know how I can run these examples

thank you,

cc @Evgeni_Popov

Thanks for reporting, this PR will fix the PGs:


@Evgeni_Popov Thank you