How to solve when you get Less @keyframe animation error. Follow the following steps:
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Check less version and upgrade it if it is not latest globally by sudo npm install less@3.9.0 -g
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Check less version by lessc -v
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If above command gives an error "/usr/bin/env: ‘node’: No such file or directory" then run below command
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ln -s /usr/bin/nodejs /usr/bin/node
(Reason why to run this command - if you install from a package manager your bin may be called nodejs so you just need to symlink it like so "ln -s /usr/bin/nodejs /usr/bin/node")