There are some problems with your database. Normally it is safe to try to fix these problems automatically however if your community is large, you may want to run the necessary queries manually. If so, the queries to run are:

UPDATE `core_streams` SET `position`=0 WHERE `position` IS NULL;

ALTER TABLE `core_streams` CHANGE COLUMN `position` `position` INT (10) NOT NULL DEFAULT 0 COMMENT 'The position in the list';

I am getting the same error. I submitted a support ticket for it.

That's a bug in the Support Tool code which checks the database, and will be fixed in the next version.

For now, you can simply ignore those errors.