### Answer
The "404 error" typically indicates that a specific resource could not be found. In the context of your scenario with Vapi, where the assistant connected using a squad is not functioning as expected, there are a few possible explanations and steps you can take:
1. **Assistant ID Verification**: Ensure that the assistant ID used for the squad connection is correct. If the ID does not exist or is incorrect, you will receive a 404 error.
2. **Squad Configuration**: Verify the configuration of the squad itself. The squad configuration needs to correctly include all assistant IDs and ensure they are active and properly set up.
3. **Logs and Diagnostics**: Review the detailed logs surrounding the time of the error to get more context on what might be causing the issue. This might give you insight into whether the error is from a misconfiguration or another issue.
If these steps don't resolve the issue, it could be beneficial to directly review the configuration settings in your Vapi dashboard or utilize Vapi's support for more tailored assistance. Unfortunately, without direct access to the system and detailed error logs, I can only provide these general steps. For more specific guidance, checking the detailed error logs or reaching out to Vapi support would be necessary.