add a space in the service launcher exception message


git-svn-id: https://svn.apache.org/repos/asf/incubator/slider/trunk@1593103 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/slider-core/src/main/java/org/apache/slider/core/main/ServiceLauncher.java b/slider-core/src/main/java/org/apache/slider/core/main/ServiceLauncher.java
index 2d50419..40bded0 100644
--- a/slider-core/src/main/java/org/apache/slider/core/main/ServiceLauncher.java
+++ b/slider-core/src/main/java/org/apache/slider/core/main/ServiceLauncher.java
@@ -290,7 +290,7 @@
 
 
   protected void error(String message, Throwable thrown) {
-    String text = "Exception:" + message;
+    String text = "Exception: " + message;
     System.err.println(text);
     LOG.error(text, thrown);
   }