[OS X TeX] Problem using \psset command in TeXShop

[Djones9976]

When I use this command in TexShop, 


\psset{unit=0.7,Alpha=90,beta=90} 


I get an error saying


Package xkeyval Error: 'beta' undefined in families ',pstricks,pst-3d,pst-tools,pst-plot,pst-node,pst-3dplot,pstricks-add'


What should I do about this?


Many thanks


D.W. Jones


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