diff --git a/LuaLibs/RunGcodeGenerate.lua b/LuaLibs/RunGcodeGenerate.lua
index f0b257c..e39af72 100644
--- a/LuaLibs/RunGcodeGenerate.lua
+++ b/LuaLibs/RunGcodeGenerate.lua
@@ -1,4 +1,4 @@
--- RunGcodeGenerate.lua by Egaltech s.r.l. 2022/05/19
+-- RunGcodeGenerate.lua by Egaltech s.r.l. 2022/06/14
 -- Calcoli prima fase per Stampa 3d
 
 -- Tabella per definizione modulo
@@ -93,7 +93,13 @@ function RunGcodeGenerate.Exec()
    EgtSetMachiningParam( MCH_MP.USERNOTES, sNotes)
 
    if not EgtApplyMachining() then
-      EgtOutBox( 'Error applying Extrusion', 'GcodeGenerate')
+      local nErr, sErr = EgtGetLastMachMgrError()
+      local sMsg = 'Error applying Extrusion'
+      if nErr == 2803 and string.find( sErr, '(3)', 1, true) then
+         sMsg = sMsg .. ' (missing Feed & Speed)'
+      end
+      EgtResetCurrMachGroup()
+      EgtOutBox( sMsg, 'GcodeGenerate')
       return
    end