[R] vis.gam zlab problem

[wildlifeduke]

I am using the mgcv package to develop vis.gam plots and having trouble
figuring out how to relabel the z-axis (image attached).  It is currently
labeled as "linear predictor," but I would like to change it to a different
name.  Currently I am using this code:
vis.gam(model1,theta=320,ticktype="detailed",color="gray",nCol=12,
zlab="BCS")  

However, when run R states: 
Error in persp.default(m1, m2, z, col = col, zlim = c(min.z, max.z), xlab =
view[1],  : 
  formal argument "zlab" matched by multiple actual arguments



Any assistance would be greatly appreciated!!

-Jared http://r.789695.n4.nabble.com/file/n3946213/BCS_Plot.jpeg 

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