Cannot find module 'gulp-util'

[pwed]

Gulp is failing to build.

Here is th output of gulp:
[13:25:32] Using gulpfile ~\PolymerStarterKit\gulpfile.js
[13:25:32] Starting 'clean'...
[13:25:32] Finished 'clean' after 594 ms
[13:25:32] Starting 'default'...
[13:25:32] Starting 'ensureFiles'...
[13:25:32] Finished 'ensureFiles' after 412 μs
[13:25:32] Starting 'copy'...
[13:25:32] Starting 'styles'...
[13:25:33] styles all files 120 B
[13:25:33] Finished 'styles' after 718 ms
[13:25:38] copy all files 27.48 MB
[13:25:38] Finished 'copy' after 5.74 s
[13:25:38] Starting 'images'...
[13:25:38] 'images' errored after 2.38 ms
[13:25:38] Error: Cannot find module 'gulp-util'
at Function.Module._resolveFilename (module.js:325:15)
at Function.Module._load (module.js:276:25)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object. (C:\PolymerStarterKit\node_modules\gulp-imagemin\index.js:3:13)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
[13:25:38] 'default' errored after 5.76 s
[13:25:38] Error in plugin 'run-sequence(images)'
Message:
Cannot find module 'gulp-util'
Details:
code: MODULE_NOT_FOUND
Stack:
Error: Cannot find module 'gulp-util'
at Function.Module._resolveFilename (module.js:325:15)
at Function.Module._load (module.js:276:25)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object. (C:\PolymerStarterKit\node_modules\gulp-imagemin\index.js:3:13)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)