VMMustBePaused -> IsolateMustBePaused

runtime/vm/service/service.md

 # Dart VM Service Protocol 3.5
 
 > Please post feedback to the [observatory-discuss group][discuss-list]
 
 This document describes of _version 3.5_ of the Dart VM Service Protocol. This
 protocol is used to communicate with a running Dart Virtual Machine.
 
 To use the Service Protocol, start the VM with the *--observe* flag.
 The VM will start a webserver which services protocol requests via WebSocket.
 It is possible to make HTTP (non-WebSocket) requests,
@@ skipping 113 matching lines @@
   }
   "id": "1"
 }
 ```
 
 Parameters for RPC requests are always provided as _named_ parameters.
 The JSON-RPC spec provides for _positional_ parameters as well, but they
 are not supported by the Dart VM.
 
 By convention, every response returned by the Service Protocol is a subtype
-of [Response](#response) and provides a _type_ paramters which can be used
+of [Response](#response) and provides a _type_ parameter which can be used
 to distinguish the exact return type. In the example above, the
 [Version](#version) type is returned.
 
 Here is an example [streamListen](#streamlisten) request which provides
 a parameter:
 
 ```
 {
   "jsonrpc": "2.0",
   "method": "streamListen",
@@ skipping 20 matching lines @@
     "code": 103,
     "message": "Stream already subscribed",
     "data": {
       "details": "The stream 'GC' is already subscribed"
     }
   }
   "id": "2"
 }
 ```
 
-In addition the [error codes](http://www.jsonrpc.org/specification#error_object)
-specified in the JSON-RPC spec, we use the following application specific error codes:
+In addition to the [error codes](http://www.jsonrpc.org/specification#error_object) specified in the JSON-RPC spec, we use the following application specific error codes:
 
 code | message | meaning
 ---- | ------- | -------
 100 | Feature is disabled | The operation is unable to complete because a feature is disabled
 101 | VM must be paused | This operation is only valid when the VM is paused
 102 | Cannot add breakpoint | The VM is unable to add a breakpoint at the specified line or function
 103 | Stream already subscribed | The client is already subscribed to the specified _streamId_
 104 | Stream not subscribed | The client is not subscribed to the specified _streamId_
 105 | Isolate must be runnable | This operation cannot happen until the isolate is runnable
+106 | Isolate must be paused | This operation is only valid when the isolate is paused
 
 
 
 
 ## Events
 
 By using the [streamListen](#streamlisten) and [streamCancel](#streamcancel) RPCs, a client may
 request to be notified when an _event_ is posted to a specific
 _stream_ in the VM. Every stream has an associated _stream id_ which
 is used to name that stream.
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 version | comments
 ------- | --------
 1.0 | initial revision
 2.0 | Describe protocol version 2.0.
 3.0 | Describe protocol version 3.0.  Added UnresolvedSourceLocation.  Added Sentinel return to getIsolate.  Add AddedBreakpointWithScriptUri.  Removed Isolate.entry. The type of VM.pid was changed from string to int.  Added VMUpdate events.  Add offset and count parameters to getObject() and offset and count fields to Instance. Added ServiceExtensionAdded event.
 3.1 | Add the getSourceReport RPC.  The getObject RPC now accepts offset and count for string objects.  String objects now contain length, offset, and count properties.
 3.2 | Isolate objects now include the runnable bit and many debugger related RPCs will return an error if executed on an isolate before it is runnable.
 3.3 | Pause event now indicates if the isolate is paused at an await, yield, or yield* suspension point via the 'atAsyncSuspension' field. Resume command now supports the step parameter 'OverAsyncSuspension'. A Breakpoint added synthetically by an 'OverAsyncSuspension' resume command identifies itself as such via the 'isSyntheticAsyncContinuation' field.
 3.4 | Add the superType and mixin fields to Class. Added new pause event 'None'.
-3.5 | Add the error field to SourceReportRange.  Clarify definition of token position.
+3.5 | Add the error field to SourceReportRange.  Clarify definition of token position.  Add "Isolate must be paused" error code.
 [discuss-list]: https://groups.google.com/a/dartlang.org/forum/#!forum/observatory-discuss