foundry: forge verify-contract error: "contract with duplicate name Vault. please pass the path instead

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (9d1a543 2022-09-08T13:14:05.2163638Z)

What command(s) is the bug in?

forge verify-contract 0x38589723f8a024cfed58f58ad36f56e45b941119 src/Vault.flattened.sol:Vault $arbiscanApiKey --watch

Operating System

No response

Describe the bug

Error: “contract with duplicate name Vault. please pass the path instead” how to proceed? even providing full windows path gives same error!