Compiler problem

[antonio9]

Hello.
I have a problem when compiling the theme magento TWEN SNS. When I enable it compiled the following error message:

Fatal error: Class ‘lessc’ not found in /home/XXXX/public_html/XXXX/includes/src/Sns_Twen_Helper_Data.php on line 151

If I disable the compilation works again, but not compiled.

Please help me.
Thanks.

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