Error 500 in Cases

[Dominion]

Hello,
Found strange error in "Cases" section (Task section works fine). The inside of previously created cases is not desplayed and the error states:
"Error 500: Entity 'AccountContragent' is not defined in metadata."
Clear cache and rebuild - not help

[emillod]

How you've created field AccountContragent?

[Dominion]

How you've created field AccountContragent?

Oh, I see: I can't find entity "AccountContragent" in Antity manager, for some reason. Have no idea how it disappeared.
Everything back to normal though. After I created entity again. Thanks!