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Warning :missing argument 2 for wpdb::prepare() and warning:cannot modify header information [duplicate]

Warning: Missing argument 2 for wpdb::prepare(), called in /home1/i9e6m0a8/public_html/contestbuzz.net/wp-content/plugins/contest-beast/contest-beast.php on line 2493 and defined in /home1/...
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How can I get $wpdb to show MySQL warnings?

In some cases, when given a bad query, will attempt to run the query, and give a warning (instead of an error). In the MySQL prompt, to see these warnings, you can run SHOW WARNINGS;. For instance: ...