What to do to resolve below issue coming in initiating a truffle project?
YuweideMacBook-Air:vantoken yuwei$ truffle version
Truffle v4.1.4 (core: 4.1.4)
Solidity v0.4.21 (solc-js)
YuweideMacBook-Air:vantoken yuwei$ **truffle init**
Downloading...
Error: Something already exists at the destination. Please unbox in an empty folder. Stopping to prevent overwriting data.
at /usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-box/lib/utils/unbox.js:22:1
at process._tickCallback (internal/process/next_tick.js:68:7)
at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)