diff --git a/src/eval-apply.c b/src/eval-apply.c
index 1af5a5bf..4d85808b 100644
--- a/src/eval-apply.c
+++ b/src/eval-apply.c
@@ -432,7 +432,7 @@ eval_apply:
   else if (R3 == cell_unspecified)
     return R1;
   else
-    error (cell_symbol_system_error, make_string0 ("eval/apply unknown continuation"));
+    assert_msg (0, "eval/apply unknown continuation");
 
 evlis:
   if (R1 == cell_nil)
@@ -873,7 +873,11 @@ begin_expand:
               else if (TYPE (R1) == TPORT)
                 input = set_current_input_port (R1);
               else
-                assert_msg (0, "0");
+                {
+                  eputs ("begin_expand failed, R1=");
+                  display_error_ (R1);
+                  assert_msg (0, "begin-expand-boom 0");
+                }
 
               push_cc (input, R2, R0, cell_vm_return);
               x = read_input_file_env (R0);
diff --git a/src/hash.c b/src/hash.c
index 9b9dddd7..34122adb 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -46,24 +46,27 @@ hashq_ (SCM x, long size)
 int
 hash_ (SCM x, long size)
 {
-  if (TYPE (x) == TSTRING)
-    return hash_cstring (cell_bytes (STRING (x)), size);
-  assert_msg (0, "0");
-  return hashq_ (x, size);
+  if (TYPE (x) != TSTRING)
+    {
+      eputs ("hash_ failed, not a string:");
+      display_error_ (x);
+      assert_msg (0, "0");
+    }
+  return hash_cstring (cell_bytes (STRING (x)), size);
 }
 
 SCM
 hashq (SCM x, SCM size)
 {
+  eputs ("hashq not supporteed\n");
   assert_msg (0, "0");
-  return make_number (hashq_ (x, VALUE (size)));
 }
 
 SCM
 hash (SCM x, SCM size)
 {
+  eputs ("hash not supporteed\n");
   assert_msg (0, "0");
-  return make_number (hash_ (x, VALUE (size)));
 }
 
 SCM
diff --git a/src/mes.c b/src/mes.c
index eca6ec58..233c900e 100644
--- a/src/mes.c
+++ b/src/mes.c
@@ -178,16 +178,16 @@ length (SCM x)
 SCM
 error (SCM key, SCM x)
 {
-#if !__MESC_MES__
-  SCM throw;
-  if ((throw = module_ref (R0, cell_symbol_throw)) != cell_undefined)
+#if !__MESC_MES__ && !__M2_PLANET__
+  SCM throw = module_ref (R0, cell_symbol_throw);
+  if (throw != cell_undefined)
     return apply (throw, cons (key, cons (x, cell_nil)), R0);
 #endif
   display_error_ (key);
   eputs (": ");
   write_error_ (x);
   eputs ("\n");
-  assert_msg (0, "0");
+  assert_msg (0, "ERROR");
   exit (1);
 }