PLE CMS

After completeing all test in browser apear the mesage...

* Dates must be in yyyy-mm-dd format.
* Times must be in hh:mm:ss format (24 hour)

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Warning: mail() [function.mail]: "sendmail_from" not set in php.ini or
custom "From:" header missing in
F:\xampp\htdocs\v1_0_beta4_2\includes\plelib\db_connect.php on line 33
ERROR: F:\xampp\htdocs\v1_0_beta4_2\includes\plelib\ple_assign.snip:59
SELECT sections.sk as section_sk, section_number, alias, memo, due_date
FROM sections, semester,users_section LEFT JOIN section_ple ON
(sections.sk=section_ple.section_sk AND ple_sk=1) WHERE
semester_sk=semester.sk AND sections.sk=users_section.section_sk AND
course_sk=1 AND users_sk=1 AND semester_sk=1 ORDER BY section_number
Unknown column 'sections.sk' in 'on clause'