[R] Error in validObject(.Object) : while running rqpd package

Hi  I have installed rqpd on r 2.15.1 win 7 os.  after loading rqpd package i get following output Loading required package: quantreg Loading required package: SparseM Attaching package: ‘SparseM’ The following object(s) are masked from ‘package:base’:     backsolve Loading requir

[R] Error in validObject(.Object) :

Hi all, I am trying to run R NDVITS package, and I am getting the following error: Error in validObject(.Object) : invalid class “GridTopology” object: cells.dim has incorrect dimension Can you please suggest any idea about understanding this error and solving it. Regards, Vahe [[al