Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

C#

.NET Core migration issue

Hello

I'm currently creating a webapp and I tried to clone the project into my desktop computer. But once I try to add migrations to prepare my DB I get the following error:

''' System.InvalidOperationException: The current CSharpMigrationOperationGenerator cannot scaffold operations of type 'Microsoft.EntityFrameworkCore.Migrations.Operations.NpgsqlCreatePostgresExtensionOperation'. Configure your services to use one that can. at Microsoft.EntityFrameworkCore.Migrations.Design.CSharpMigrationOperationGenerator.Generate(MigrationOperation operation, IndentedStringBuilder builder) at CallSite.Target(Closure , CallSite , CSharpMigrationOperationGenerator , Object , IndentedStringBuilder ) at Microsoft.EntityFrameworkCore.Migrations.Design.CSharpMigrationOperationGenerator.Generate(String builderName, IReadOnlyList1 operations, IndentedStringBuilder builder) at Microsoft.EntityFrameworkCore.Migrations.Design.CSharpMigrationsGenerator.GenerateMigration(String migrationNamespace, String migrationName, IReadOnlyList1 upOperations, IReadOnlyList1 downOperations) at Microsoft.EntityFrameworkCore.Migrations.Design.MigrationsScaffolder.ScaffoldMigration(String migrationName, String rootNamespace, String subNamespace) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_01.<Execute>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) The current CSharpMigrationOperationGenerator cannot scaffold operations of type 'Microsoft.EntityFrameworkCore.Migrations.Operations.NpgsqlCreatePostgresExtensionOperation'. Configure your services to use one that can. '''

Does anyone have an idea how to fix this? I'm using postgres (npgsql) since this is a school project and it was recommended by our lecturer.

Thank you in advance!

1 Answer

I solved it by re-pulling the project. Something probably went missing while pulling the project before :)