Index: lldb/trunk/source/Host/macosx/Host.mm
===================================================================
--- lldb/trunk/source/Host/macosx/Host.mm
+++ lldb/trunk/source/Host/macosx/Host.mm
@@ -1345,13 +1345,13 @@
         FileSpec expand_tool_spec;
         if (!HostInfo::GetLLDBPath(lldb::ePathTypeSupportExecutableDir, expand_tool_spec))
         {
-            error.SetErrorString("could not find argdumper tool");
+            error.SetErrorString("could not get support executable directory for argdumper tool");
             return error;
         }
         expand_tool_spec.AppendPathComponent("argdumper");
         if (!expand_tool_spec.Exists())
         {
-            error.SetErrorString("could not find argdumper tool");
+            error.SetErrorStringWithFormat("could not find argdumper tool: %s", expand_tool_spec.GetPath().c_str());
             return error;
         }