ME sale este error en consola y no se por que.

Error while compiling AutoDoors: The type 'System.Text.StringBuilder' 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.Text.StringBuilder' to 'Facepunch.Pool.IPooled'. | Line: 433, Pos: 30