----[less2cc] Compile Error----

[skyline0705]

Writing file /Users/Skyline0705/Desktop/untitled.less with encoding UTF-8 [less2css] Converting /Users/Skyline0705/Desktop/untitled.less to ./untitled.css ----[less2cc] Compile Error---- Error: EACCES, permission denied '/untitled.css' at Object.fs.openSync (fs.js:427:18) at Object.fs.writeFileSync (fs.js:966:15) at /usr/local/lib/node_modules/less/bin/lessc:160:24 at Object.Parser.parser.parse (/usr/local/lib/node_modules/less/lib/less/parser.js:476:17) at parseLessFile (/usr/local/lib/node_modules/less/bin/lessc:147:8) at fs.js:266:14 at Object.oncomplete (fs.js:107:15)

but when i use "lessc -x ./untitled.less > ./untitled.css",it works