Hmm, I don't know enough to give you a confident answer yet. However, I can point you to some relevant information from past support conversations that might help you troubleshoot the issue. In a similar situation, a user faced an "Internal Server Error: Get Spec job failed" message when trying to add a custom connector in the Airbyte UI. The support team suggested checking the logs of the spec job and ensuring that the image was pulled to the machine before attempting to add the connector [source](https://airbytehq.slack.com/archives/C021JANJ6TY/p1666713517970759). Another user faced a similar issue when trying to update a custom connector. They resolved the issue by building the Docker image with

--platform linux/amd64

, which fixed the compatibility issue between their computer and Airbyte [source](https://airbytehq.slack.com/archives/C021JANJ6TY/p1670252832457049). If these suggestions don't help, you can refer to the [Airbyte documentation](https://docs.airbyte.com) for more information and guidance.