Search for duplicate files

Error creating thumbnail: About to transcode 1 SVG file(s) Converting Princess_of_France.svg to /var/www/html/w/images/temp/transform_01c001b8acd1.png ... org.apache.batik.transcoder.TranscoderException: null Enclosed Exception: file:/var/www/html/w/images/temp/svg_d303bc0fd38c1125e57dbeb7/Princess_of_France.svg:-1 Cannot find the referenced element: "#_x31_" specified on the element <use> - may be a problem of 'id' at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:228) at org.apache.batik.transcoder.image.ImageTranscoder.transcode(ImageTranscoder.java:92) at org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:142) at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:158) at org.apache.batik.apps.rasterizer.SVGConverter.transcode(SVGConverter.java:1008) at org.apache.batik.apps.rasterizer.SVGConverter.execute(SVGConverter.java:719) at org.apache.batik.apps.rasterizer.Main.execute(Main.java:956) at org.apache.batik.apps.rasterizer.Main.main(Main.java:1009) Caused by: org.apache.batik.bridge.BridgeException: file:/var/www/html/w/images/temp/svg_d303bc0fd38c1125e57dbeb7/Princess_of_France.svg:-1 Cannot find the referenced element: "#_x31_" specified on the element <use> - may be a problem of 'id' at org.apache.batik.bridge.BridgeContext.getReferencedNode(BridgeContext.java:762) at org.apache.batik.bridge.BridgeContext.getReferencedElement(BridgeContext.java:804) at org.apache.batik.bridge.SVGUseElementBridge.buildCompositeGraphicsNode(SVGUseElementBridge.java:124) at org.apache.batik.bridge.SVGUseElementBridge.createGraphicsNode(SVGUseElementBridge.java:98) at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:213) at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171) at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:219) at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171) at org.apache.batik.bridge.GVTBuilder.build(GVTBuilder.java:82) at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:210) ... 7 more ... error (SVGConverter.error.while.rasterizing.file)