Changing timezone bug

i have php error while setting my timezone in profile, here is the error:

Code:

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A PHP Error was encountered



Severity: Warning



Message: min() [function.min]: When only one parameter is given, it must be an array



Filename: libraries/Form_validation.php



Line Number: 619

A PHP Error was encountered



Severity: Warning



Message: Cannot modify header information - headers already sent by (output started at /home/twil/public_html/system/core/Exceptions.php:185)



Filename: libraries/Session.php



Line Number: 675

A PHP Error was encountered



Severity: Warning



Message: Cannot modify header information - headers already sent by (output started at /home/twil/public_html/system/core/Exceptions.php:185)



Filename: helpers/url_helper.php



Line Number: 542

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