[Therion] SVG output gives blank file and compiling error

[Andrew Atkinson]

Using 5.4.3ds1-4 on Debian testing

The thconfig.thc at

http://www.cave-registry.org.uk/svn/WookeyCatchment/SludgePit/

works fine for pdf map output, but if I try to output svg a file is
produced that does not display in any of the svg programs I have. It
also does not finishing compiling giving a red ERROR in xtherion

The log file just seems to stop

here is the end of it


##################### end of pdftex log file #####################
done
writing output/SludgePitP.svg ...
####################### metapost log file ########################
This is MetaPost, version 2.00 (TeX Live 2019/dev/Debian) (kpathsea
version 6.3.1/dev)  25 FEB 2019 13:01
**data.mp
(/usr/share/texlive/texmf-dist/metapost/base/mpost.mp
(/usr/share/texlive/texmf-dist/metapost/base/plain.mp
Preloading the plain mem file, version 1.005) ) (./data.mp
{randomseed:=42}
 [4001] [4002] [4003] [4004] [4005] [4006] [4007] [4008] [4009] [4010]
[4011] [
4012] [4013]
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]
[18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31]
[Warning: scrap outline intersects itself in scrap
4PotsLowerSP2 at Maze.SludgePit
] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46]
[47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61]
[62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73]




I have also tried xhtml which the manual says is  SVG embedded in XHTML
file which contains also legend

and only a legend is produced. Spent a while looking at the manual and
wiki pages, and not finding my mistake, can anyone help

thanks

Andrew