[R-sig-Geo] probit with fixed effect SPML package error

[az14]

Dear list, 
I'm trying to estimate a spatial probit with fixed effect using the spml
package on R.
library(splm) 
library(plm)
 data1<-pdata.frame(data1,c("dc","year"))
memory.limit(size=4000)


fm<-coop~x1+x2+x3+x4+wx1+wx2+wx4
listw1<-mat2listw(mat5)
es<-spml(formula=fm,effect="twoways",model="within",lag=TRUE,data=data1,listw=listw)
 but i have this error 
Error: cannot allocate vector of size 544.5 Mb

Any help would be appreciated.
Thank you.



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