System No response with this code {"code":0,"message":"Failed to run code in sandbox on behalf of application's system user.","errorData":{}}

General
1

Hi Team

Please check that our application got one issue with below repsonse code:

{“code”:0,“message”:“Failed to run code in sandbox on behalf of application’s system user.”,“errorData”:{}}

Is that Backendless end error ? Kindly check
Our application ID: 96A33344-0C65-AC14-FF0D-C71CD4DDCA00

Best regards
Nyi Nyi Lin

2

Hi, @FMS_APP

We are sorry for the inconvenience. Our team is working on it. This problem is of the highest priority for us.

Regards,
Marina

3

@FMS_APP, The issue that you wrote about above has been fixed from our side. Can you confirm that everything is working as it should now?

Regards,
Marina

4

The issue has been fixed from our side.
Could you please check if it works fine now?

Regards,
Olha

5

Hello @olhadanylova,

We are also experiencing the same error. It occurs in one of our methods, BackendlessLoginAuthRest.
image

Please check. Thank you!
APP ID: 4A47197B-AE30-FA84-FF56-0071F4010900

6

Francis,

What is the name of the service?
Does the method accept any arguments? If so, what values should we use?

We need to be able to reproduce the error in order to understand what happened.

Regards,
Mark

7

Hello Mark,

Thank you for checking. We have this in the BG_01_ADMIN service, but the main logic resides within the function itself.

image
image550×184 5.88 KB

The function does accept arguments, and you can use the object below as input.

{
  "action": "update",
  "method": "LeadUpdateEvent",
  "requestType": "serverSide",
  "createObject": {
    "sdr": "Fred",
    "state": "United States, Florida",
    "region": "US",
    "school": "⏳ Alexis/Andreas",
    "status": "enrolled",
    "service": "Microschool",
    "objectId": "36164F41-42D3-4763-B98C-D6F3475D23FA",
    "timezone": "US/Eastern",
    "chargebee": "cus_RnVJ8o3*******",
    "parent_name": "Meriyam"
  },
  "databaseName": "weekly_slots"
}
8

Hi Francis.

I ran the function and received a response. I need to be able to reproduce the problem. Do you know what conditions could trigger it?

API Services - brilliant_grades - Backendless 2026-06-24 10-20-36
API Services - brilliant_grades - Backendless 2026-06-24 10-20-361411×828 112 KB

9

I’m not sure what could have triggered it, since it was working fine before and the logic hasn’t been updated.

We’re now encountering a “socket hang up” error as well.
image

10

Does it happen every time for you? I tried just now and got a valid response from the server.