Problems with net2VOSviewer(net)

[Donadb08]

Hi, guys! I have a problem with opening the net file from R.

Script #Bibliographic collaboration (Authors) M1 <- metaTagExtraction(M, Field = "AU_CO", sep = ";") NetMatrix <- biblioNetwork(M1, analysis = "collaboration", network = "authors", sep = ";") net=networkPlot(NetMatrix, normalize = NULL, weighted=NULL, n = NULL,degree=3, Title = "Authors' Collaboration",type ="circle",size=5,size.cex=T,remove.multiple=TRUE,labelsize=0.8,label.n=10,label.cex=F) networkPlot(NetMatrix, normalize = NULL, weighted=NULL, n = 10,degree=15, Title = "Authors' Collaboration",type ="circle",size=5,size.cex=T,remove.multiple=TRUE,labelsize=0.8,label.n=10,label.cex=F) net2VOSviewer(net)

I have the NET file, but when I try to open it in VOSViewer, I get an error (see image attached) and I don't know how to fix it. I have tried different analyses, but I wasn't able to open the file in VOSviewer as the file as invalid.

Thank you very much! Best regards.