Import as layer artifacts

[Anonymous]

hello everyone,

i am getting spots on my model when i use the import as layer option, i'm importing a low poly & a high poly mesh that was exported from Zbrush,& using exactly the method and settings provided on autodesk help, here is a screen shot of my low poly & high poly mesh, & the imported as layer artifacts, i'm getting these spots on my extracted texture maps as well, here are the pictures showing the low poly, high poly, and the high poly imported as layer ( with the spots)

[Anonymous]

i tried adding the AUVtiles option in Zbrush , now i'm getting spikes instead of holes !