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

[Vishal Chari]

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 required package: MatrixModels
Loading required package: Matrix
Loading required package: lattice

Attaching package: ‘Matrix’

The following object(s) are masked from ‘package:SparseM’:

    det

Loading required package: Formula
Warning messages:
1: package ‘quantreg’ was built under R version 2.15.3 
2: package ‘SparseM’ was built under R version 2.15.3 
3: package ‘MatrixModels’ was built under R version 2.15.3 
4: package ‘lattice’ was built under R version 2.15.3 
5: package ‘Formula’ was built under R version 2.15.3 
6: In rm(.First.lib, envir = myEnv) : object '.First.lib' not found

whcih i fix by running following command 

> as.environment(match("package:rqpd", search()))
<environment: package:rqpd>
attr(,"name")
[1] "package:rqpd"
attr(,"path")
[1] "C:/Users/fossil/Documents/R/win-library/2.15/rqpd"


tried running example file 
> data(bwd)
> cre.form <- dbirwt ~ smoke + dmage + agesq + novisit + pretri2 + pretri3 | 
> momid3 | smoke + dmage + agesq 
> crem.fit <- rqpd(cre.form, panel(method="cre"), data=bwd)

i get following error 


Error in validObject(.Object) : 
  invalid class “dsparseModelMatrix” object: superclass "mMatrix" not 
defined in the environment of the object's class


do i need to install 2.15.3?
how can i solve this problem?

please help 
thanks in advance 

vishal
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