Error processing lectures/prob_dist.md: Error: structural parity check failed for lectures/prob_dist.md: - directive count differs: source has 55, output has 66 — a wholesale mismatch usually means the document was re-fenced or truncated - directive #6 name changed: source line 247 has {note}, output line 146 has {code-cell} - directive #54 name changed: source line 983 has {code-cell}, output line 863 has {exercise}