Marketplace doesn't like to work

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[Fatal Error] :1:1: Content is not allowed in prolog.
org.xml.sax.SAXParseException: Content is not allowed in prolog.
at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at org.pentaho.marketplace.MarketplaceService.loadPluginsFromSite(MarketplaceService.java:489)
at org.pentaho.marketplace.MarketplaceService.getPlugins(MarketplaceService.java:90)
at org.pentaho.marketplace.MarketplaceService.getPluginsJson(MarketplaceService.java:354)
at org.pentaho.marketplace.MarketplaceContentGenerator.getpluginsjson(MarketplaceContentGenerator.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at pt.webdetails.cpf.SimpleContentGenerator.createContent(SimpleContentGenerator.java:58)
at org.pentaho.platform.web.servlet.GenericServlet.doGet(GenericServlet.java:261)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

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