"Could not start external merge program"

I'm getting this error whenever I try to use TortoiseSVN's "edit
conflicts" tool:

Could not start external merge program!
--------
The directory name is invalid.

Similarly, I get the same error only with "diff" instead of "merge"
when trying to compare revisions. For that, I even tried installing
WinMerge and set up TortoiseSVN to use that external program, and I
get the same error.

I am running Windows Vista 64-bit edition and here is my version
information:

TortoiseSVN 1.5.4, Build 14259 - 64 Bit , 2008/10/11 08:23:13
Subversion 1.5.3,
apr 1.2.12
apr-utils 1.2.12
berkeley db 4.4.20
neon 0.28.3
OpenSSL 0.9.8i 15 Sep 2008
zlib 1.2.3

Anyone have any ideas on how I might resolve this?

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Received on 2008-10-24 17:55:21 CEST