Vellum Grain filecache timed out after certain frames

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Hi there, I am very new to Houdini

So I have a simulation that initally has around 1M grains, then this error message kept on showing up. I tried to reduced the amount of grains to around 750k, it still shows up
Below is the error message...I guess maybe it is to do with OpenCL neighborsearch?

[16:58:00.329] ERROR: The attempted operation failed. Error:       Cook error in input: /obj/walkman/v26/OUT_CACHE Error:       Invalid source /obj/walkman/Simulation_DOP Error:       vellumobject1 - /obj/walkman/Simulation_DOP/new_vellum_Solver/ocl_neighborsearch_grains: Warning:     Invalid attribute specification: "/obj/walkman/Simulation_DOP/new_vellum_Solver/ocl_neighborsearch_grains/neighborsearchcl1: Missing name or piece attribute.". Error:       /obj/walkman/Simulation_DOP/new_vellum_Solver/ocl_neighborsearch_grains/neighborsearchcl1: NaN detected in particle position...
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Also how many grains can Vellium grain simulation normally support? I send an attachment of my substeps and everything else
Many thanks everyone

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Sometimes the grains will fly off...when there is more than 750k particles like this

Attachments:
flying_grain.PNG (414.0 KB)

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