Fix error flow error message propagate issue

Author: ashera96

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/utils/APIUtil.java

@@ -10426,10 +10426,10 @@ public static String invokeAIService(String endpointConfigName, String authToken
             if (statusCode == HttpStatus.SC_CREATED) {
                 return responseStr;
             } else if (statusCode == HttpStatus.SC_UNAUTHORIZED) {
-                throw new APIManagementException("Unexpected response detected from the AI service." + responseStr,
+                throw new APIManagementException("Unexpected response detected from the AI service. " + responseStr,
                         ExceptionCodes.AI_SERVICE_INVALID_ACCESS_TOKEN);
             } else {
-                throw new APIManagementException("Unexpected response detected from the AI service." + responseStr,
+                throw new APIManagementException("Unexpected response detected from the AI service. " + responseStr,
                         ExceptionCodes.AI_SERVICE_INVALID_RESPONSE);
             }
         } catch (MalformedURLException e) {

components/apimgt/org.wso2.carbon.apimgt.rest.api.store.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/store/v1/impl/ApisApiServiceImpl.java

@@ -293,7 +293,8 @@ public Response apiChatPost(String apiId, String apiChatAction, ApiChatRequestDT
                             ApiChatResponseDTO.class);
                     return Response.status(Response.Status.CREATED).entity(preparationResponseDTO).build();
                 } catch (APIManagementException | IOException e) {
-                    String errorMessage = "Error encountered while executing the prepare statement of API Chat service";
+                    String errorMessage = "Error encountered while executing the prepare statement of API Chat " +
+                            "service. Cause: " + e.getCause().getMessage();
                     RestApiUtil.handleInternalServerError(errorMessage, e, log);
                 }
 
@@ -360,7 +361,7 @@ public Response apiChatPost(String apiId, String apiChatAction, ApiChatRequestDT
                     return Response.status(Response.Status.CREATED).entity(responseDTO).build();
                 } catch (APIManagementException | IOException e) {
                     String errorMessage = "Error encountered while executing the API Chat service to accommodate the " +
-                            "specified testing requirement";
+                            "specified testing requirement. Cause: " + e.getCause().getMessage();
                     RestApiUtil.handleInternalServerError(errorMessage, e, log);
                 }
             } else {