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It sounds like there is an invalid/empty path to your XML file containing the data query. Go to "Data Queries" on the Cacti menu, and click any data query. Make sure it says "XML File Exists", or the query will not work.
I also have the same problem. Has anybody been able to solve it yet ?
My feeling is that the variable $xml_file_path is not filled correctly.
How can I see what's in there`?
I also can not view graphs if I click on them and when I clear polling cache, I get the error. Have any of you tried that to see if you get the same errors in those locations?
I have loaded the latest Cacti and all the prerequisits onto a new Window2000 server.
Get same error messages as above and when I try to view any graghs (including debug) get 'cannot find page' and I am then unable to web page back and windon locks. Need to start anoth session.