refactor: transform ContractNegotiationErrorMessage to ContractNegotiationError

negotiation/contract.negotiation.binding.https.md

@@ -15,10 +15,10 @@ The OpenAPI definitions for this specification can be accessed [here](TBD).
 
 2. All request and response messages must use the `application/json` media type.
 
-### 2.2 NegotiationErrorMessage
+### 2.2 ContractNegotiationError
 
 In the event of a client request error, the connector must return an appropriate HTTP 4xxx client error code. If an error body is returned it must be
-a [ContractNegotiationErrorMessage](./message/contract.negotiation.error.message.json) with the following properties:
+a [ContractNegotiationError](./message/contract.negotiation.error.json) with the following properties:
 
 | Field         | Type          | Description                                                 |
 |---------------|---------------|-------------------------------------------------------------|

negotiation/contract.negotiation.protocol.md

@@ -180,21 +180,21 @@ without providing an explanation. Nevertheless, the sender may provide a descrip
 
 - If an error is received in response to a ContractNegotiationTermination, the sending party may choose to ignore the error.
 
-### 6. ContractNegotiationErrorMessage
+## ContractNegotiationError
 
 **Sent by**: Consumer or Provider
 
-**Example**: [NegotiationErrorMessage](./message/contract.negotiation.error.message.json)
+**Example**: [NegotiationError](./message/contract.negotiation.error.json)
 
-**Schema**: [ContractNegotiationErrorMessageShape](../../schemas/contract-negotiation-error-message-shape.ttl)
+**Schema**: [ContractNegotiationErrorShape](../../schemas/contract-negotiation-error-message-shape.ttl)
 
 #### Description
 
-The _ContractNegotiationErrorMessage_ is a message returned by a consumer or provider indicating an error has occurred. It does not cause a state transition.
+The _ContractNegotiationError_ is an object returned by a consumer or provider indicating an error has occurred. It does not cause a state transition.
 
 #### Notes
 
-- A _ContractNegotiationErrorMessage_ is different to an error response. A _ContractNegotiationErrorMessage_ does not necessarily finish the negotiation but can continue
+- A _ContractNegotiationError_ is different to an error response. A _ContractNegotiationError_ does not necessarily finish the negotiation but can continue
   afterwards.
 
 ## Hash and Signature Calculations

negotiation/message/contract.negotiation.error.message.json → negotiation/message/contract.negotiation.error.json

@@ -1,6 +1,6 @@
 {
   "@context":  "https://w3id.org/idsa/v5/context.json",
-  "@type": "ids:ContractNegotiationErrorMessage",
+  "@type": "ids:ContractNegotiationError",
   "ids:processId": "urn:uuid:a343fcbf-99fc-4ce8-8e9b-148c97605aab",
   "ids:code": "...",
   "ids:reasons": [