"Failed to get property: gid" error in geoserver sql view

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I have a postgis data with 777 features. In geoserver, i created a sql view with another table. In the wms request i can see all features, in qgis also i can see all features. but in wfs output as csv or geojson i only get 55 features. On doing wfs with openlayers it gives error

java.lang.RuntimeException: Failed to get property: gidFailed to get property: gidjava.lang.String cannot be cast to com.vividsolutions.jts.geom.Geometry

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