Hello, I'm encountering the following error, under ConTeXt ver: 2012.05.30 11:26 MKIV fmt: 2013.3.11 int: english/english: system > tex > error on line 27 in file data/three-volume-book-book-1.tex: terminal: >> NOfTextColumns-1 ! Improper final value has been replaced by 0. <to be read again> : <*> for i=1 upto NOfTextColumns-1: draw (rightboundary TextColumns[i]) shif... ... 17 \safeinput ./data/statistics-for-area-area-africa.tex 18 \safeinput ./data/statistics-for-area-area-europe.tex 19 20 21 22 \input ./macros/E16pagenohead.tex 23 \ifodd \pageno \else \noheaderandfooterlines \null \page[yes]\fi \noheade randfooterlines 24 25 \startptp{ 26 \pagereference[Languages]\pnum{Part II}\ptitle{Language Listings} 27 >> }\stopptp This error is very odd because: a) The only place I can find code mentioning "NOfTextColumns-1" is in mp-core.mpii, where it's commented out! % \startuseMPgraphic{whatever} % for i=1 upto NOfTextColumns-1 : % draw (rightboundary TextColumns[i]) shifted ... But maybe I just haven't been looking in the right places. b) The place in my .tex document where the error occurs, line 27, is at a \stopptp. Yet there is an essentially identical start/stopptp earlier in the document, where no such error is thrown: \startptp{ \pagereference[Summaries]\pnum{Part I}\ptitle{Statistical Summaries} }\stopptp So I guess there's some content in between the two starts/stop ptp's that's laying the stage for the error to occur. I'll be working on a minimal example, but that's time-consuming; and I thought in the meantime, there may be some clues in the above information that could help clarify the nature of the problem, to someone who understands the inner workings of ConTeXt. Thanks for any help, Lars