Raw files are a different format for every camera model. That affects the version of Camera Raw required to open them.
Which Sony camera model do you have?
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The A6000 was first supported in Camera Raw 8.4 (and later).
CS6 on OS X 10.6.8 is only compatible with Camera Raw up to version 8.3.
Unfortunately, according to the above link, the free DNG converter 8.4 also requires OS X 10.7 or later.
- Upgrade your operating system or computer,
- Use the Sony software which came with your camera to open the Raw files and save them as TIFFs. Then edit in CS6.