Symfony2 Assetic yuicompressor unkown error

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http://stackoverflow.com – I recently configured yuicompressor for my symfony installation. But i dont get it working. I always get this error message shown below. It doesnt matter which javascript code i try to filter. Does someone has any ideas? I dont know how/where to fix this... [Assetic\Exception\FilterException] An error occurred while running: (HowTos)