[TYPO3-install] Solving Error | No pages are found on the rootlevel!

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I got this messsage as I installed:


mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /homepages/8/d245642030/htdocs/sounddesign/typo3_src+dummy-4.2.6/t3lib/class.t3lib_db.php on line 809

Warning: mysql_free_result(): supplied argument is not a valid MySQL result resource in /homepages/8/d245642030/htdocs/sounddesign/typo3_src+dummy-4.2.6/t3lib/class.t3lib_db.php on line 836

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /homepages/8/d245642030/htdocs/sounddesign/typo3_src+dummy-4.2.6/t3lib/class.t3lib_db.php on line 809

Warning: mysql_free_result(): supplied argument is not a valid MySQL result resource in /homepages/8/d245642030/htdocs/sounddesign/typo3_src+dummy-4.2.6/t3lib/class.t3lib_db.php on line 836

Warning: Cannot modify header information - headers already sent by (output started at /homepages/8/d245642030/htdocs/sounddesign/typo3_src+dummy-4.2.6/t3lib/class.t3lib_db.php:809) in /homepages/8/d245642030/htdocs/sounddesign/typo3_src+dummy-4.2.6/typo3/sysext/cms/tslib/class.tslib_fe.php on line 944



This is how I solved the problem:


I updated T3 to the version I installed (4.2.6) and updated the DB.


Best Regards to everyone,

Andrés