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....and where is your application (web page) relative to the API?
Just to be sure...
those errors are very similar to mine when I call a page with api > 3.0 with the phisycal path "file:///C:/inetpub/wwwroot/test.html" instead of "localhost/test.html".
Are you calling your page in the proper way, right? In this case, are esri samples working on your webserver?
Save the attached file (localapitest.htm) to the root of your site, in your case that appears to be C:\xampp\htdocs\
The click this link:
http://localhost/localapitest.htm
(it's just the sample file from the API zip)
What do you see?
(need to zip attachement to upload)
and in the configuration i put this url:
localhost/arcgis_js_api/library/3.1/jsapi/js/dojo/dojo
or
192.168.13.56/arcgis_js_api/library/3.1/jsapi/js/dojo/dojo
<script type="text/javascript"> var dojoConfig = { baseUrl:"http://localhost/arcgis_js_api/library/3.1/jsapi/js/dojo/dojo/" }; </script>