diff --git a/src/image/ImagePool.cc b/src/image/ImagePool.cc
index 57e5560cc5..fc514f2a59 100644
--- a/src/image/ImagePool.cc
+++ b/src/image/ImagePool.cc
@@ -255,7 +255,12 @@ int ImagePool::disk_attribute(VectorAttribute * disk,
        
         if ( uiid == -1)
         {
-            error_str = "Cannot get user set in IMAGE_UID or IMAGE_UNAME.";
+            ostringstream oss;
+
+            oss << "User " << uid << " does not own an image with name: "
+                << source << ". Set IMAGE_UNAME or IMAGE_UID of owner in DISK.";
+            error_str =  oss.str();
+
             return -1; 
         }
 
diff --git a/src/vnm/VirtualNetworkPool.cc b/src/vnm/VirtualNetworkPool.cc
index 3f0efef8f6..a7db6d984f 100644
--- a/src/vnm/VirtualNetworkPool.cc
+++ b/src/vnm/VirtualNetworkPool.cc
@@ -192,7 +192,8 @@ VirtualNetwork * VirtualNetworkPool::get_nic_by_name(VectorAttribute * nic,
     if (vnet == 0)
     {
         ostringstream oss;
-        oss << "Virtual network " << name << " does not exist for user " << uid;
+        oss << "User " << uid << " does not own a network with name: " << name
+            << "Set NETWORK_UNAME or NETWORK_UID of owner in NIC.";
 
         error = oss.str(); 
     }