Formidable error uploading file "Exdev, rename ..."

var form = new formidable when using formadble. Incomingform ();

Form.uploaddir () is not set, the default is Os.tmpdir (), which is the default for the current user of the operating system Temp directory

Error "Exdev, rename ..." When executing the upload file command .

Online Enquiry http://ouyo.info/show.php?pid=1898 said to be a permission issue cannot save files temporarily (no test using writefilesync).

a directory From.uploaddir (__dirname + '/dirname1/dirname2/dirname3 ... ') is specified manually, specified as one of the directories in the current application, and then the test is OK.

Formidable error uploading file "Exdev, rename ..."