TypeError: Cannot call method "toCSS" of undefined (file:/ <site path> /plugins/lessengine/lib/lesscss-engine-1.3.0.jar!/META-INF/engine.js#36) about lesscss-engine HOT 5 CLOSED

Have you ever succeeded running the library using JavaLoader? Otherwise please post a little snippet that introduces this error. There is obviously something wrong but I need to reproduce it somehow and I need to know more.

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I have seen this error too. The reason it happened for me was that I was trying to import a less file that did not exist using

@import "something.less";

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We are also getting this when an imported file has a syntax error. We're currently looking at putting together a test case and possibly a fix if we can work out what's going wrong.

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Actually, that pull request didn't fix the case of a non-existent file - that needs an extra null check in the exception handling. I've updated the original request.

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FYI, for anyone reaching this via Google, and has linux servers & Windows dev machines: Make sure your imports have the correct capitalization + always use "/" and never "" in paths.

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