Emails Stucked in Email queue Please Help

Dear Community,

I'm using plesk Obsidian for linux. i have a problem with send and receiving emails.

When sending or receiving emails i found them listed in email queue in plesk settings.

I tried to fix plesk using the following command. plesk repair db

But unfortunately i get an error (screen shot attached).

Please help me asap, all my domain mails are blocked i can't receive or send any thing.