Error messages with theme replace

[kirkstrobeck]

(cd www; echo Y | theme replace)
Are you sure you want to completely replace your shop theme assets? This is not undoable.
Continue? (Y/N):  Y
[05:13:51] Error: Could not remove config/settings_data.json
Error Details: {:status=>nil, :request_id=>"0bbe8519-1a22-4672-bad2-de85b1f57d8c"}
[05:13:51] Error: Could not remove config/settings_schema.json
Error Details: {:status=>nil, :request_id=>"2cb5950b-bd75-4a1b-89df-0dd0cb25076f"}
[05:13:52] Error: Could not remove layout/theme.liquid
Error Details: {:status=>nil, :request_id=>"9ba98d0e-7b38-4e6e-82d9-dbb2d55d9e6a"}
[05:13:52] Error: Could not remove templates/blog.liquid
Error Details: {:status=>nil, :request_id=>"aac7f513-b740-41a2-88e7-6e666d6272cf"}
[05:13:52] Error: Could not remove templates/cart.liquid
Error Details: {:status=>nil, :request_id=>"36d1d99f-6aeb-4f41-a5b0-a352f16315fa"}
[05:13:52] Error: Could not remove templates/collection.liquid
Error Details: {:status=>nil, :request_id=>"71a2e435-6689-4d07-8b42-1b70ed502199"}
[05:13:52] Removed: templates/customers/register.liquid
[05:13:53] Removed: templates/customers/reset_password.liquid
[05:13:53] Removed: templates/gift_card.liquid

Why does it say Error: Could not remove? What can I do to prevent it?