INTERNAL ERROR: Error in graph

[Henk-Jan.van.Tuyl]

L.S.,

Hugs gives the following error message when running the attached program:
Program error:
Program error: pattern match failure
(288112 reductions, 525181 cells, 9 garbage collections)
INTERNAL ERROR: Error in graph

This happens after reading 508 files; heap space is 250000.
The problem most probably stems from the return of function collectFileData, as this was the last changed part.
I am runnnig Hugs Nov 2003 on Windos 98.

-- 
Best regards,
Henk-Jan van Tuyl