Hi,
thanks for your post and the screenshot.
Those errors are a result of an incorrect import of an HTML table into WP-Table Reloaded. Likely, your table has invalid HTML in it (like wrong nesting of the elements), or there might be something wrong with the character encoding (like “special” characters, e.g. from foreign languages), due to which the table can not be read from the database.
I do not recommend to add those error_reporting things into your wp-config.php file, as argonius describes, because that will not change or fix the issue. It will just hide the error message, which however is better down by fixing the import and the table.
As a start please delete the table that was imported incorrectly (within WP-Table Reloaded) and upload the HTML file that you were trying to import and post a link to it, please.
Thanks!
Tobias