| Index: samples/leap/leap_server.dart | 
| diff --git a/samples/leap/leap_server.dart b/samples/leap/leap_server.dart | 
| index 1812491aa64388bdad121b1cef78eee3875d2586..c2c419308a0a501c772e54fe190d4ff5a886768b 100644 | 
| --- a/samples/leap/leap_server.dart | 
| +++ b/samples/leap/leap_server.dart | 
| @@ -43,7 +43,7 @@ class Conversation { | 
| } | 
| if (path.contains('..') || path.contains('%')) return notFound(); | 
| var f = new File("./$path"); | 
| -    f.exists((bool exists) { | 
| +    f.exists().then((bool exists) { | 
| if (!exists) return notFound(); | 
| if (path.endsWith('.dart')) { | 
| response.headers.add(HttpHeaders.CONTENT_TYPE, "application/dart"); | 
|  |