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From: Maarten Sneep <maarten.sneep@xs4all.nl>
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Subject: Re: Metafun error
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On dinsdag, mei 20, 2003, at 17:59 Europe/Amsterdam, John Culleton 
wrote:
> This is MetaPost, Version 0.641 (Web2C 7.3.7x)
> (test-mpgraph.mp
>>> spotcolors
>>> true
> ! Equation cannot be performed (numeric=boolean).
> <to be read again>
>                    ;
> l.23 spotcolors := true ;

> Any ideas?

Have you recently updated your context installation? If so, something 
may have gone wrong there, I once had the same problem. Some files were 
moved or renamed, and is a standard reinstall are _not_ overwritten by 
the new version. Mixing and old and a new version is not a good idea.

Solution: remove the current context related stuff from 
texmf/tex/context and texmf/metapost/context and reinstall.

Maarten

A prune isn't really a vegetable... Cabbage is a vegetable