I have tiddlers with those exact tags and fields except capitalized, so I 
copied and pasted whatever's code, changed the case of the first letters, 
and it worked for me. 
One thing to try would be limiting the "where" criteria so that it only 
finds tiddlers that actually contain the field "author":

where
       'tiddler.tags.contains("Book")&&tiddler.data("Author")'

cmari

On Saturday, March 31, 2012 9:14:22 AM UTC-5, James wrote:
>
> Hi Whatever, 
> thanks again for the reply, but I still get the same error with the 
> code you provided. 
>
> <<forEachTiddler 
>     where 
>         'tiddler.tags.contains("book")' 
>     sortBy 
>         tiddler.data("author") 
>          ascending 
>
>     write 
>       '"|"+tiddler.data("author")+"|[["+tiddler.title+"]]|\n"' begin 
> '"|Author|Book Title|h\n"'>>

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