Please explain this error message. I typed the code right out of the text.

*To*: mathgroup at smc.vnet.net*Subject*: [mg57283] Please explain this error message. I typed the code right out of the text.*From*: Bookreader <bookreader127 at yahoo.com>*Date*: Mon, 23 May 2005 02:20:58 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Following is my input directly from the text and the output returned. I am using Mathematica Version 5.0. How can I find a list of error messages and their meanings? What does this particular error message mean? After the error message is "more ..." I infer that there is more information available. If so, how do I access it? I looked in the online help and there is no entry for error messages. Thanks for your help. In[23]:= << Graphics`SurfaceOfRevolution`; In[24]:= main = SurfaceOfRevolution[f[x], {x, 0, 3.1}, RevolutionAxis \[Rule] {1, 0, 0}, PlotPoints\[Rule] {20, 30}]; In[25]:= cap = SurfaceOfRevolution[f[x], {x, 3.1, 3.25}, RevolutionAxis \[Rule] {1, 0, 0}, PlotPoints\[Rule] {5, 30}]; In[29]:= Show[main, cap] From In[29]:= Show::gcomb: An error was encountered in combining the graphics objects in Show[<<2>>] . More? Out[29]= Show[SurfaceOfRevolution[f[x], {x, 0, 3.1}, RevolutionAxis -> {1, 0, 0}, PlotPoints -> {20, 30}], SurfaceOfRevolution[f[x], {x, 3.1, 3.25}, RevolutionAxis -> {1, 0, 0}, PlotPoints -> {5, 30}]]