ChildProjectApiImpl: Fix error message

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I780adbe850a9f75617534b268e5217847655a77c
diff --git a/java/com/google/gerrit/server/api/projects/ChildProjectApiImpl.java b/java/com/google/gerrit/server/api/projects/ChildProjectApiImpl.java
index 1f950bd..25e56fe 100644
--- a/java/com/google/gerrit/server/api/projects/ChildProjectApiImpl.java
+++ b/java/com/google/gerrit/server/api/projects/ChildProjectApiImpl.java
@@ -49,7 +49,7 @@
       getChildProject.setRecursive(recursive);
       return getChildProject.apply(rsrc).value();
     } catch (Exception e) {
-      throw asRestApiException("Cannot child project", e);
+      throw asRestApiException("Cannot get child project", e);
     }
   }
 }