I am sure you know already just sharing the error I am getting 

Error while compiling ZoneDomes: The type 'System.Collections.Generic.List<string>' cannot be used as type parameter 'T' in the generic type or method 'Pool.Free<T>(ref T)'. There is no implicit reference conversion from 'System.Collections.Generic.List<string>' to 'Facepunch.Pool.IPooled'. | Line: 147, Pos: 18

Change the following lines in the plugin

line 147

Pool.Free(ref invalidZones);
to
Pool.FreeUnmanaged(ref invalidZones);​

Pool.Free(ref sb);
to
Pool.FreeUnmanaged(ref sb);​

Pool.Free(ref sb);
to
Pool.FreeUnmanaged(ref sb);​

Thanks Bro)