"Cannot call method slice of undefined"

[bx2]

I get this error every time I try to render less file with less.js in Chrome.
In Firefox the error is - d.extract[1] is undefined.

I'm using latest less.js from dist/ directory.

[andrzej-aa]

That problem is caused by this code:
.aa {
color: red;
strong {
text-decoration: underline;
.aa;
}
}

[bx2]

yea - I solved till now, but still more clear error would be awesome :)

[burlapdesign]

@bx2 and @andrezj-aa and I have the same issue with similar code how did you solve the issue. Thanks for helping an utter n00b

[javifr]

Hi bx2 ! how did you solve it?

[bx2]

Well - it was a problem with the my stylesheet code - like @andrzej-aa commented.
I found that it is much better no to nest statements too much - less.js was not handling that too good afaik ;)

As for the exact example - sorry it was so long ago that I just don't remember - my bad because I should publish the solution here - sorry guys :(

[zkhalapyan]

I also have this problem while compiling Tweeter Bootstrap.

[korjavin]

yep, twitter bootstrap crashed with this error

[zkhalapyan]

@korjavin You should use an older version of Less.

[toddsundsted]

@korjavin/all I just ran into this problem with less v1.2.0 (specifically http://lesscss.googlecode.com/files/less-1.2.0.min.js). I downgraded to less v1.1.5 (http://lesscss.googlecode.com/files/less-1.1.5.min.js) and the problem disappeared.

[zkhalapyan]

So far Less v1.2.0 is very buggy - I wouldn't suggest using it until it's more stable.

-----Original Message-----
From: Todd Sundsted [mailto:reply@reply.github.com]
Sent: Monday, January 16, 2012 5:56 AM
To: Khalapyan, Zorayr
Subject: Re: [less.js] "Cannot call method slice of undefined" (#159)

@korjavin/all I just ran into this problem with less v1.2.0 (specifically http://lesscss.googlecode.com/files/less-1.2.0.min.js). I downgraded to less v1.1.5 (http://lesscss.googlecode.com/files/less-1.1.5.min.js) and the problem disappeared.

---

Reply to this email directly or view it on GitHub:
#159 (comment)

[lukeapage]

This bug is not very specific.. I read it as "improve errors" - and later on you talk about less being buggy without giving examples. better error handling is in #16 so I consider this a duplicate. Please raise a new bug for issues if it is not a dupe and you have a test case.

[DeFeNdog]

I had the same problem in Bootstrap3 and was able to fix it by initiating carousel within jQuery(document).ready. I also made sure to match the markup as specified in http://getbootstrap.com/javascript/#carousel. In my case, I was missing the active class in

. Cheers