Hello,

I am using Maple 13 under Linux and cannot seem to plot.  I get a message like

Error, (in plot) type `has_unit` does not exist
 

Furthermore, the Table, Plot, Drawing and Spreadsheet menus are greyed out so I cannot access them.  How can I rectify this?  Are these features disabled for some reason under Linux?

I am new to Maplet programming and came across this problem while looking trying to build a simple application. Running the code results in: "Error, (in Maplets:-Tools:-CleanUp:-SetOption) the target `("REF")("enabled")` refers to a non-existant element" I am at a loss for why this is the case. From what I read, I am doing this right, but if anyone can see the problem... I would appreciate the help.