How do I get rid of invalid DOCTYPE?

[FRANK ROCCO]

Severity Description Resource In Folder Location Creation Time Id
2 Could not find a DOCTYPE with a valid Tapestry DTD (public id). 
StockQuote.application StockQuote/context/WEB-INF line 0 February 1, 2006 
9:59:12 AM 511

  How can I tell eclipse to ignore this?
   
  Thanks
   
  Frank