ionic2 - ionic serve not working after installing ionic 2 -

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recently installed ionic2.

after when try run/open (i.e. ionic serve) ionic 1 projects have done earlier throwing me message:

"warn: ionic.project has been renamed ionic.config.json, please rename it. uh oh! looks you're missing module in gulpfile: cannot find module 'gulp' need run npm install?"

i have tried installing bower,gulp, gulp-util. nothing worked. has got issue? can me?


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