Solver: Mage: Add error file by default.

src/Solver/Mage.py

@@ -663,6 +663,7 @@ class Mage(CommandLineSolver):
             f.write("* OUTPUT\n")
             f.write(f"TRA {name}.TRA\n")
             f.write(f"BIN {name}.BIN\n")
+            f.write(f"ERR {name}.ERR\n")
 
             for file in files:
                 EXT = file.split('.')[1]