Note: Below is the original page from the Bootlint documentation, some of the info here might not apply to Bootlint-NG!

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E002

Found one or more uses of outdated Bootstrap v2 .spanN grid classes

Bootlint is only compatible with Bootstrap v3.x.x, but it found some uses of Bootstrap v2.x.x's grid system classes (.span1 thru .span12) in your document.

You should upgrade to Bootstrap v3 and its grid system, or stop using Bootlint.