Hi zzzlor,
Sorry for the delay. It most probably comes from the Settings “PackMointPoint”, as mentioned in the error message boxes.
PackMountPoint is the root directory in UE’s Content Browser where all imported PopcornFX assets must be imported under.
ImportSourcePack is the “real” “physical” directory of your pack, the one in your windows explorer, the one you open with PopcornFX Editor. It’s used to auto-import PKFX asset dependencies (textures, meshes, etc…).
So, say your “real” source pack ImportSourcePack is "D:.…\MyPopcornFXPack".
And you set PackMountPoint to “/Game” (“/Game” is the true name of the “Content” in UE’s Content Browser).
Then if you have a “D:.…\MyPopcornFXPack**Particles\MyEffect.pkfx", then it is advise to import it in UE "/Game/**Particles/MyEffect.pkfx”. And if this pkfx uses, say “D:.…\MyPopcornFXPack**Textures\MyDiffuse.png", asset dependency auto-import will import it in "/Game/**Texture/MyDiffuse.png”.
If you had set PackMountPoint to “/Game/MyPopcornFX”, the imported path shall have been “**/Game/MyPopcornFX/Particles/MyEffect.pkfx" and "/Game/MyPopcornFX/**Texture/MyDiffuse.png”.
(Also, all assets used by PopcornFX (texture, meshes etc…) must also be under PackMountPoint)