classic / classical
A standard example versus the ancient world, or art of that tradition.
Classic means of lasting value, or typical: a classic study, a classic mistake. Classical means of Greek and Roman antiquity, or of the related tradition in music and architecture: classical Latin, classical music. A classic symphony is one held up as a model. Classical music is the tradition.
Examples
Usea classic error
Useclassical architecture
Avoida classical error (If you mean only “typical.”)