I installed Jobberbase on a local server, but the .htaccess file causes an Internal Server Error:

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Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, you@example.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
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When I leave out the .htaccess file, the homepage looks perfect (only the links don't work). Oh and I'm using XAMPP on a Mac as my local server by the way ... Anyone any thoughts?