The GGML_ASSERT error is likely caused by running out of memory (OOM). Since you have 16GB of RAM, it's possible that the model you're trying to load requires more memory than what is available. You can try the following steps to resolve the issue:

1. Reboot your MacBook to free up memory.
2. Close any unnecessary applications or processes running in the background to free up additional memory.
3. If the issue persists, you may need to upgrade your RAM to a higher capacity.

Keep in mind that running large models like CodeLlama may require a significant amount of memory, so it's important to ensure that your system meets the minimum requirements.