# Fixed: Error on yarn start: Tapable.plugin is deprecated

**URL:** https://discourse.roots.io/t/fixed-error-on-yarn-start-tapable-plugin-is-deprecated/14488
**Category:** sage
**Tags:** sage9
**Created:** 2019-01-04T08:56:42Z
**Posts:** 2

## Post 1 by @el_skak — 2019-01-04T08:56:42Z

Hi all,

After I have tried to install sage on a lot of different node versions I keep on ending up getting an error on “yarn start”

Its a clean install on an empty WordPress. I’m currently using Node 8.9.0

git clone [https://github.com/roots/sage](https://github.com/roots/sage) . (OK)  
yarn (OK)  
yarn start (FAIL)

One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:

- webpack-cli ([https://github.com/webpack/webpack-cli](https://github.com/webpack/webpack-cli))  
The original webpack full-featured CLI.  
We will use “yarn” to install the CLI via “yarn add -D”.  
Do you want to install ‘webpack-cli’ (yes/no):

I have tried to say “no”, but that dosen’t help me.

So after installing webpack-cli, I end up with this message:

yarn start v0.27.5  
$ webpack --hide-modules --watch --config resources/assets/build/webpack.config.js

webpack is watching the files…

(node:13252) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead  
TypeError: result.setExpression is not a function  
at Parser.evaluateExpression (/Users/bo/Sites/testsite.test/wp-content/themes/sage/node\_modules/webpack-cli/node\_modules/webpack/lib/Parser.js:1987:14)  
at parser.hooks.statementIf.tap.statement (/Users/bo/Sites/testsite.test/wp-content/themes/sage/node\_modules/webpack-cli/node\_modules/webpack/lib/ConstPlugin.js:122:28)

Anybody know ho to fix this?

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## Post 2 by @el_skak — 2019-01-04T09:06:25Z

Hi again,  
It seems that all I had to do was to upgrade my yarn version to v. 1.12.3:  
brew upgrade yarn

Cheers :slight_smile:

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## Post 3 by @system — 2019-02-15T08:56:43Z

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