Enable full text search

[leduythuccs]

If you search with the full-text search option, an error will occur because the default database not support full text search. You have to do it by hand:

ALTER TABLE judge_problem ADD FULLTEXT(code, name, description);

Or you can set Enable_FTS to False in the local_settings
Source: DMOJ/docs#100

[leduythuccs]

Solution for VNOJ: set Enable_FTS to False.