nature tree soft occlusion leaves

hi ive only just learn of hdrp and am trying to use it i imported some models id made in 3ds max of some plants
and used the nature tree soft ocluusion leaves as this gave double sided to my leaves
but it dosnt work in hdrp its pink
i can use mobile particle alpha blended ?
is this the best option
thanks i did search but couldnt find an awser

 

oh well hdrp has blown me out i've lost my scene as it dosnt load now i get an error
error

1. CS1061: 'ShadowSplitData' does not contain a definition for 'shadowCascadeBlendCullingFactor' and no accessible extension method 'shadowCascadeBlendCullingFactor' accepting a first argument of type 'ShadowSplitData' could be found (are you missing a using directive or an assembly reference?)

ive googled it but cant find the fix