Why does my campaign account now have a camp error?

I use my Facebook account to create a campaign. When I create a campaign, it shows an error has occurred. Do you have any way to help me fix it?

I’ve seen Facebook just suddenly block campaign creation with vague errors like that. First step: clear your browser cache and try a different browser or incognito. If that doesn’t work, check if your ad account was flagged for policy issues—sometimes a quick appeal in Business Manager can fix it.