gruntjs – grunt-contrib-copy throwing警告：path.join的参数必须是字符串使用–force继续

Running "copy:group1" (copy) task
Warning: Arguments to path.join must be Strings Use --force to conTinue.

Aborted due to warnings.

Gruntfile.js

@H_235_7@module.exports = function(grunt) { grunt.initConfig({ copy : { group1 : { files : [ { src : ['group1/js/*'],dest : ['lib/group1/js/'] } ] } } }); grunt.loadNpmTasks('grunt-contrib-copy'); };

以下是grunt copy -v的结果

Initializing
Command-line options: --verbose

Reading "Gruntfile.js" Gruntfile...oK

Registering Gruntfile tasks.
Initializing config...oK

Registering "grunt-contrib-copy" local Npm module tasks.
Reading /home/sasidhar/projects/grunt/node_modules/grunt-contrib-copy/package.json...oK
Parsing /home/sasidhar/projects/grunt/node_modules/grunt-contrib-copy/package.json...oK
Loading "copy.js" tasks...oK
+ copy
Loading "Gruntfile.js" tasks...oK
>> No tasks were registered or unregistered.

Running tasks: copy

Running "copy" task

Running "copy:group1" (copy) task
Verifying property copy.group1 exists in config...oK
Files: group1/js/js1.js,group1/js/js2.js,group1/js/js3.js -> lib/group1/js/
Options: processContent=false,processContentexclude=[]
Warning: Arguments to path.join must be Strings Use --force to conTinue.

Aborted due to warnings.

我已经提到其他Stackoverflow Question上的类似错误.但是我的GruntJS已经有了Sindre Sorhus提到的修复.

提前致谢.