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Troubleshooting

This document covers some common node-sass issues and how to resolve them. You should always follow these steps before opening a new issue.

TOC

Installation problems

Assertion failed: (handle->flags & UV_CLOSING), function uv__finish_close

This issue primarily affected early node-sass@3.0.0 alpha and beta releases, although it did occassionally happen in node-sass@2.x.

The only fix for this issue is to update to node-sass >= 3.0.0.

If this didn't solve your problem please open an issue with the output from our debugging script.

Cannot find module '/root/<...>/install.js'

Linux

This can happen if you are install node-sass as root, or globally with sudo. This is a security feature of npm. You should always avoid running npm as sudo because install scripts can be unintentionally malicious. Please check npm documentation on fixing permissions.

If you must however, you can work around this error by using the --unsafe-perm flag with npm install i.e.

$ sudo npm install --unsafe-perm -g node-sass

If this didn't solve your problem please open an issue with the output from our debugging script.

Glossary

Which node runtime am I using?

There are two primary node runtimes, Node.js and io.js, both of which are supported by node-sass. To determine which you are currenty using you first need to determine which node runtime you are running.

node -v

If the version reported begins with a 0, you are running Node.js, otherwise you are running io.js.

Which version of node am I using?

To determine which version of Node.js or io.js you are currenty using run the following command in a terminal.

node -v

The resulting value the version you are running.

Debugging installation issues.

Node sass runs some install scripts to make it as easy to use as possible, but some times there can be issues. Before opening a new issue please follow the instructions for Windows or Linux/OSX and provide their output in you GitHub issue.

Remember to always search before opening a new issue.

Windows

Firstly create a clean work space.

mkdir \temp1
cd \temp1

Check your COMSPEC environment variable.

node -p process.env.comspec

Please make sure the variable points to C:\WINDOWS\System32\cmd.exe

Gather some basic diagnostic information.

npm -v
node -v
node -p process.versions
node -p process.platform
node -p process.arch

Clean npm cache

npm cache clean

Install the latest node-sass

npm install -ddd node-sass > npm.log 2> npm.err

Note which version was installed by running

npm ls node-sass
y@1.0.0 /tmp
└── node-sass@3.8.0

If node-sass could not be installed successfully, please publish your npm.log and npm.err files for analysis.

You can download reference known-good logfiles to compare your log against.

If node-sass install successfully lets gather some basic installation infomation.

node -p "require('node-sass').info"
node-sass       3.8.0   (Wrapper)       [JavaScript]
libsass         3.3.6   (Sass Compiler) [C/C++]

If the node-sass installation process produced an error, open the vendor folder.

cd node_modules\node-sass\vendor

Then, using the version number we gather at the beginning, go to https://github.com/sass/node-sass/releases/tag/v<your-version>.

There you should see a folder with same name as the one in the vendor folder. Download the binding.node file from that folder and replace your own with it.

Test if that worked by gathering some basic installation infomation.

node -p "require('node-sass').info"
node-sass       3.8.0   (Wrapper)       [JavaScript]
libsass         3.3.6   (Sass Compiler) [C/C++]

If this still produces an error please open an issue with the output from these steps.

Linux/OSX

Firstly create a clean work space.

mkdir ~/temp1
cd ~/temp1

Gather some basic diagnostic information.

npm -v
node -v
node -p process.versions
node -p process.platform
node -p process.arch

Install the latest node-sass

npm install node-sass

Note which version was installed by running

npm ls node-sass
y@1.0.0 /tmp
└── node-sass@3.8.0

If node-sass install successfully lets gather some basic installation infomation.

node -p "require('node-sass').info"
node-sass       3.8.0   (Wrapper)       [JavaScript]
libsass         3.3.6   (Sass Compiler) [C/C++]

If the node-sass installation process produced an error, open the vendor folder.

cd node_modules/node-sass/vendor

Then, using the version number we gather at the beginning, go to https://github.com/sass/node-sass/releases/tag/v<your-version>.

There you should see a folder with same name as the one in the vendor folder. Download the binding.node file from that folder and replace your own with it.

Test if that worked by gathering some basic installation infomation.

node -p "require('node-sass').info"
node-sass       3.8.0   (Wrapper)       [JavaScript]
libsass         3.3.6   (Sass Compiler) [C/C++]

If this still produces an error please open an issue with the output from these steps.

Using node-sass with Visual Studio 2015 Task Runner.

If you are using node-sass with VS2015 Task Runner Explorer, you need to make sure that the version of node.js (or io.js) is same as the one you installed node-sass with. This is because for each node.js runtime modules version (node -p process.versions.modules), we have a separate build of native binary. See #532.

Alternatively, if you prefer using system-installed node.js (supposedly higher version than one bundles with VS2015), you may want to point Visual Studio 2015 to use it for task runner jobs by following the guidelines available at: http://blogs.msdn.com/b/webdev/archive/2015/03/19/customize-external-web-tools-in-visual-studio-2015.aspx.