- The callback_error_ handle was never being setup.

runtime/vm/dart_api_impl.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_DART_API_IMPL_H_
 #define VM_DART_API_IMPL_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 
@@ skipping 88 matching lines @@
   // Returns an Error handle if isolate is in an inconsistent state.
   // Returns a Success handle when no error condition exists.
   static Dart_Handle CheckIsolateState(Isolate *isolate);
 
   // Casts the internal Isolate* type to the external Dart_Isolate type.
   static Dart_Isolate CastIsolate(Isolate* isolate);
 
   // Gets the handle used to designate successful return.
   static Dart_Handle Success(Isolate* isolate);
 
-  // Sets up the callback error object after initializing an Isolate. This
+  // Sets up the acquired error object after initializing an Isolate. This
   // object is pre-created because we will not be able to allocate this
   // object when the error actually occurs. When the error occurs there will
   // be outstanding acquires to internal data pointers making it unsafe to
   // allocate objects on the dart heap.
-  static void SetupCallbackError(Isolate* isolate);
+  static void SetupAcquiredError(Isolate* isolate);
 
-  // Gets the handle which holds the pre-created callback error object.
-  static Dart_Handle CallbackError(Isolate* isolate);
+  // Gets the handle which holds the pre-created acquired error object.
+  static Dart_Handle AcquiredError(Isolate* isolate);
 
   // Returns true if the handle holds a Smi.
   static bool IsSmi(Dart_Handle handle) {
     // TODO(turnidge): Assumes RawObject* is at offset zero.  Fix.
     RawObject* raw = *(reinterpret_cast<RawObject**>(handle));
     return !raw->IsHeapObject();
   }
 
   // Returns the value of a Smi.
   static intptr_t SmiValue(Dart_Handle handle) {
@@ skipping 57 matching lines @@
 // Start a scope in which no Dart API call backs are allowed.
 #define START_NO_CALLBACK_SCOPE(isolate)                                       \
   isolate->IncrementNoCallbackScopeDepth()
 
 // End a no Dart API call backs Scope.
 #define END_NO_CALLBACK_SCOPE(isolate)                                         \
   isolate->DecrementNoCallbackScopeDepth()
 
 #define CHECK_CALLBACK_STATE(isolate)                                          \
   if (isolate->no_callback_scope_depth() != 0) {                               \
-    return reinterpret_cast<Dart_Handle>(Api::CallbackError(isolate));         \
+    return reinterpret_cast<Dart_Handle>(Api::AcquiredError(isolate));         \
   }                                                                            \
 
 }  // namespace dart.
 
 #endif  // VM_DART_API_IMPL_H_