r - I got !header: invalid argument type" -


i'm using r calculate matrix:

but in code i'm trying use functions assign , past, got

!header: invalid argument type

this part of code: 

assign(paste("tableau",1),read.csv(paste("~/bureau/mohamed/etude_donnees_durance/precalcul/frequences/2006/",f[1],sep="/"),header=t,sep="/",dec="."))


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