node.js - grunt --tasks error path.js:488 throw new TypeError('Arguments to path.join must be strings') -


my node v0.12.7, , grunt grunt-cli v0.1.13 grunt v0.4.5.

the following dependencies in package.json.

"bower": "1.3.8",     "grunt": "0.4.5",     "grunt-bower": "0.18.0",     "grunt-cachebuster": "0.1.5",     "grunt-check-dependencies": "0.3.1",     "grunt-cli": "0.1.13",     "grunt-connect-proxy": "0.2.0",     "grunt-contrib-clean": "0.5.0",     "grunt-contrib-compress": "0.10.0",     "grunt-contrib-connect": "0.5.0",     "grunt-contrib-copy": "0.5.0",     "grunt-contrib-cssmin": "0.9.0",     "grunt-contrib-jshint": "0.11.0",     "grunt-contrib-requirejs": "0.4.4",     "grunt-contrib-watch": "0.5.3",     "grunt-git-describe": "2.3.2",     "grunt-karma": "0.10.1",     "grunt-replace": "0.8.0",     "grunt-requirejs": "0.4.2",     "grunt-shell": "0.6.4",     "grunt-version-copy-bower-components": "^0.1.11",     "jasmine-core": "2.2.0",     "karma": "0.12.31",     "karma-chrome-launcher": "0.1.7",     "karma-jasmine": "0.3.5",     "karma-phantomjs-launcher": "0.1.4",     "karma-requirejs": "0.2.2",     "karma-spec-reporter": "0.0.12",     "load-grunt-config": "0.13.2",     "path": "^0.11.14",     "requirejs": "2.1.16",     "shelljs": "0.3.0"

and following gruntfile.js

  require('load-grunt-config')(grunt, {     configpath: path.join(process.cwd(), 'tasks')   })

i search many materials told me have fixed it. me it?

my error stacks 

typeerror: arguments path.join must strings   @ object.posix.join (path.js:488:13)   @ object.file.exists (/users/zwshao/rea/widgets_new/node_modules/grunt/lib/grunt/file.js:381:28)   @ task.loadtasks (/users/zwshao/rea/widgets_new/node_modules/grunt/lib/grunt/task.js:371:18)   @ array.foreach (native)   @ task.task.init (/users/zwshao/rea/widgets_new/node_modules/grunt/lib/grunt/task.js:457:33)   @ object.grunt.tasks (/users/zwshao/rea/widgets_new/node_modules/grunt/lib/grunt.js:120:8)   @ object.module.exports [as cli] (/users/zwshao/rea/widgets_new/node_modules/grunt/lib/grunt/cli.js:38:9)   @ object.<anonymous> (/usr/local/lib/node_modules/grunt-cli/bin/grunt:45:20)   @ module._compile (module.js:460:26)   @ object.module._extensions..js (module.js:478:10)   @ module.load (module.js:355:32)   @ function.module._load (module.js:310:12)   @ function.module.runmain (module.js:501:10)   @ startup (node.js:129:16)   @ node.js:814:3


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