AutoDock Vina "Parse Error: Unknown Tag" — 7 Proven Fixes

By BioDockify Computational Research Team · September 3, 2026 · Troubleshooting

Fix the Vina parse error "Unknown or inappropriate tag": root causes, exact commands, a 30-second diagnosis flowchart and a prevention checklist for PDBQT inputs.

Read the complete article with tables, code and references on BioDockify.

Key References

• Trott O, Olson AJ. AutoDock Vina: improving the speed and accuracy of docking with a new scoring function, efficient optimization, and multithreading. J Comput Chem. 2010;31(2):455-461. doi:10.1002/jcc.21334
• AutoDock Vina file format and preparation documentation, Scripps Research Institute.
• RCSB Protein Data Bank format documentation for PDB and PDBQT conversion context.

Scope & Limitations

Covers Vina 1.1.x and 1.2.x error variants; AutoDock4 (not Vina) legitimately uses flexible-receptor files and will not show this error