BUG: misleading error message of provide a directory if indeed "source file not exists" or "target project not clean"

[MarkShawn2020]

Tks to YO, I later would do more concise tests when available.

yo vscode-modern
Initializing VS Code Extension Generator
? Your extension name: test-csm-template-vscode-extension-dev-webview
? Your extension display name: test csm template vscode extension dev webview
? Your extension description: A modern VS Code extension
? Your extension publisher id: cs-magic
? Select project type: Standalone Extension
? Select package manager: pnpm
? Would you like to include webview support? Yes
? Would you like to use Jotai for state management in the webview? Yes
? Would you like to use Tailwind CSS for styling? Yes
✖️ An error occured while running vscode-modern:app#writing
Error vscode-modern 

When copying multiple files, provide a directory as destination

[mshima]

This issue should be reported in vscode-modern generator repository.