access to path denied

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C#

i use searcharoo4 on my site on the internet.when the search.aspx page loads this error apears.
"access to the path c:\Inetpub\z_searcharoo.dat is denied"
source error:

Line 35:         Spider cat = new Spider();
Line 36:         cat.SpiderProgressEvent += new SpiderProgressEventHandler (OnProgressEvent);
Line 37:         _Catalog = cat.BuildCatalog (new Uri(Preferences.StartPage));
Line 38:        Cache [Preferences.CatalogCacheKey] = _Catalog;
Line 39:

what can i do?