node.js - ENOTUP warning using grunt in Azure -

in simple copy task in azure werservice warning stop build process

warning: enotsup: operation not supported on socket, scandir

my copy task config

  dist: {    nonull: true,    files: [{     expand: true,     src: [       '<%= app.dir %>/*.js',       '<%= app.dir %>/dev/*.js',       '<%= app.dir %>/models/*.js',       '<%= app.dir %>/src/*.js',       'build/*/*',       'public/*/*',       'iisnode.yml',       'server.js',     ],     dest: '<%= dist.tmp %>',   }] 

}

node version : 5.1.1

how can fix problem? or suggestion appreciated

currently, found maybe need remove iisnode.yml src list. issnode.yml not javascript script configuration file iisnode, , raise grunt warning , throw exception on side. haven't reproduced issue.

so if convenient of provide project repo or complete gruntfile content, great helpful reproduce issue.