Error 500 when i try to post on my database

Website URL

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Error Message

Error 500 when i submit a form. my credential are good , i verified 4 times.

(please share the FULL error message you see, if applicable)

Other Information

the thing is , i have saved a one line in my table for my first submit, after this, it was broken. my host is sql102.infinityfree.com.

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Thks, the alter php config, displays errors messages now.