sfsd I'm sorry to hear you're having trouble. I have removed the image you attached because it contained information about your email address as registered in your license.
The problem may seem complicated because several messages are displayed, but the "Slot is hidden:" message is just a reminder that you hid the slot instead of the attachment, so it will be displayed in the exported result. So even if this message appears, the packing itself is still possible.
The next message “[error] Unablet to delete existing files." is the more important one. Have you recently updated your macOS? Perhaps Spine is no longer authorized to write or delete files at that time. Could you please check if Spine is set to write files in your system settings?
