Inspect tool complains about Subversion client

I'm using the inspect tool locally by running inspect.exe from the /mylibrary/doc folder 
 
Inspect reports are prefixed by:
 
"boost-no-inspect" svn: E155021: This client is too old to work with the working copy at
'I:\boost-sandbox' (format 31). You need to get a newer Subversion client. For more details, see
http://subversion.apache.org/faq.html#working-copy-format-change
 
I've rebuilt to use the latest trunk versions of Quickbook and Inspect.
 
I'm using Tortoise 1.8.3 32 bit and Subversion 1.8.5 - the latest.
 
I've tried to update boost-sandbox (containing the libraries I am checking) but it reports they are
on version 1.8 already.
 
The inspect reports look plausible. 
 
Should I be worried about this?
 
Paul
 
 
 
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Paul A. Bristow,
Prizet Farmhouse, Kendal LA8 8AB  UK
+44 1539 561830  07714330204
[email protected]