Data Base connection s are not running in Upper UIPATH Release version

Activity could not be loaded because of errors in XAML.

File ‘CheckEmailFormat.xaml’ - variable ‘dbConn’: Type ‘ua:DatabaseConnection’ (‘clr-namespace:UiPath.Activities;assembly=UiPath.Activities’) could not be resolved and was automatically replaced with ‘UnknownType’

Developed In Uipath version2018.1.4 working fine.
Not working in version 2018.3.1

Can you please try to Repair dependency of UiPath.Database.Activities?

In Studio - Project panel - Dependencies - Right click on UiPath.Database.Activities and choose Repair Dependency.

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repair dependency option showing disable