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Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /pdf/index.php:2) in /pdf/index.php on line 2

Warning: Cannot modify header information - headers already sent by (output started at /pdf/index.php:2) in /pdf/fpdf.php on line 1037
FPDF error: Some data has already been output to browser, can't send PDF file
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Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0