node.js - Grunt-contrib-watch error when compiling less files -

not sure why keep getting these errors when running watch task.

grunt watch task

# watch task watch:  options:   nospawn: true   livereload: true  server_coffee:   files: ['server/**/*.coffee']   tasks: ['coffee:changed']  server_copy:   files: ['server/**/*.!(coffee)']   tasks: ['copy:changed']  client_coffee:   files: ['client/**/*.coffee']   tasks: ['coffee:changed']  client_copy:   files: ['client/**/*.!(coffee)']   tasks: ['copy:changed'] 

grunt event

# watch changed files grunt.event.on 'watch', (action, filepath) ->   # determine server or client folder  path = if filepath.indexof('client') isnt -1 'client' else 'server'  cwd = "#{path}/"  filepath = filepath.replace(cwd,'')           # minimatch coffee files  if minimatch filepath, '**/*.coffee'   # compile changed file   grunt.config.set('coffee',    changed:     expand: true     cwd: cwd     src: filepath     dest: "#{path}-dist/"     ext: '.js'   )    # minimatch others  if minimatch filepath, '**/*.!(coffee)'   # copy changed file   grunt.config.set('copy',    changed:      files: [       expand: true       cwd: cwd       src: filepath       dest: "#{path}-dist/"      ]   ) 

notes

• happens sporadically

errors

any 1 of these errors.

node(11548,0x7fff70ce7cc0) malloc: *** error object 0x100c329c8: incorrect checksum freed object - object modified after being freed. *** set breakpoint in malloc_error_break debug [1]    11548 abort      grunt build  assertion failed: (("libev: ev_io_stop called illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax)), function ev_io_stop, file     ../deps/uv/src/unix/ev/ev.c, line 2699. [1]    11930 abort      grunt build  node(11189,0x7fff70ce7cc0) malloc: *** error object 0x100a35f68: pointer being freed  not allocated *** set breakpoint in malloc_error_break debug [1]    11189 abort      grunt build  [1]    11479 segmentation fault  grunt build