The table is damaged and you need to run a repair on it. Do you have access to phpMyAdmin?
If you can get into your Admin Panel navigate to Maintenance, then select Repair/Optimize Tables.
Select the postparsed table (or all of them, it will not hurt), then make sure both Optimize and Repair options are set to yes, then click continue.
If you can not get to your admin panel you can use phpMyAdmin
Login there and navigate to your database (if you have more than 1)
Click on the "postparsed" table on thr right and then the Operations tab at the top.
At the bottom of the right panel, under "Table maintenance" select "Repair Table"
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