arcgis for js geometryServices.relation(relationParams)求相交报错？

SyntaxError: Unexpected token <
at Object.b.fromJson (init.js:226)
at Object.json (init.js:183)
at t (init.js:188)
at c (init.js:74)
at d (init.js:74)
at b.Deferred.resolve.callback (init.js:75)
at init.js:191
at k (init.js:195)
at r (init.js:195)
at f.resolve (init.js:197) "SyntaxError: Unexpected token <
at Object.b.fromJson (http://localhost:8080/arcgis_j ... 26:309)
at Object.json (http://localhost:8080/arcgis_j ... 83:373)
at t (http://localhost:8080/arcgis_j ... 188:81)
at c (http://localhost:8080/arcgis_j ... 74:221)
at d (http://localhost:8080/arcgis_j ... :74:10)
at b.Deferred.resolve.callback (http://localhost:8080/arcgis_j ... 75:350)
at http://localhost:8080/arcgis_j ... 1:300
at k (http://localhost:8080/arcgis_j ... 95:431)
at r (http://localhost:8080/arcgis_j ... 95:357)
at f.resolve (http://localhost:8080/arcgis_j ... 97:441)"
l @ init.js:205