ajax - jQuery aspx error function always called, even with apparently valid return data -

i making ajax call using jquery (jquery-1.5.2.min.js). server receives call. fiddler shows response text coming apparently correct. in javascript error: function called instead of success: function, , data of parameters error function don't give clue problem.

here's function make initial call:

function selectcbgatclickedpoint() {     $.ajax( {         type: "get",         datatype: "text",         url: "http://localhost/ajax/selectcbgatpoint/1/2",         success:             function( msg )             {                 alert( "success: " + msg );             },         error:             function( jqxhr, textstatus, errorthrown )             {                 alert( "error: " + jqxhr + textstatus + errorthrown );             }     } ); } 

here's function handle call in cherrypy server code:

def ajax( ajax, *args ):     lock:         print "ajax request received: " + str( args )          cherrypy.response.headers[ "content-type" ] = "application/text"          return "{ x: 0 }" 

cherrypy odd beast, , thinking problem must lie there. say, see both query go out , response come in fiddler. here fiddler shows raw view of response:

http/1.1 200 ok date: mon, 11 apr 2011 17:49:25 gmt content-length: 8 content-type: application/text server: cherrypy/3.2.0  { x: 0 } 

looks good, in javascript, error: function, following values parameters (as shown in firebug):

errorthrown = "" jqxhr = object { readystate=0, status=0, statustext="error"} statustext = "error" 

i don't know word "error" coming from. string not appear anywhere in cherrypy server code.

note though i'm returning json string i've set send , receive types "text" now, simplify in order isolate problem.

any ideas why i'm getting "error" reply, when errorthrown empty? haven't "initialized" either jquery or jquery.ajax?

my problem same m katz, had browser pointed file:///c:/temp.html , jquery considering request cross domain. however, setting crossdomain property true had no effect. had move page under web project, once did magically started work.