Hi

Been working on a Umbraco 8 website, all working fine in 8.6.2, added in Vendr and all fine. Been working on the site for a couple of weeks.

I added in an API Controller last night, ran Umbraco to test the API call and got hit by this:

Boot failed: Umbraco cannot run. See Umbraco's log file for more details.

-> Umbraco.Core.Exceptions.BootFailedException: Boot failed.

-> System.InvalidOperationException: The migration plan does not support migrating from state "1dc031f7-57c6-48f3-a85f-d2a2a1f3643d".
  at Umbraco.Core.Migrations.MigrationPlan.ThrowOnUnknownInitialState(String state) in d:\a\1\s\src\Umbraco.Core\Migrations\MigrationPlan.cs:line 278
  at Umbraco.Core.Migrations.MigrationPlan.Execute(IScope scope, String fromState, IMigrationBuilder migrationBuilder, ILogger logger) in d:\a\1\s\src\Umbraco.Core\Migrations\MigrationPlan.cs:line 306
  at Umbraco.Core.Migrations.Upgrade.Upgrader.Execute(IScopeProvider scopeProvider, IMigrationBuilder migrationBuilder, IKeyValueService keyValueService, ILogger logger) in d:\a\1\s\src\Umbraco.Core\Migrations\Upgrade\Upgrader.cs:line 67
  at Vendr.Core.Composing.VendrCoreComponent.Initialize()
  at Umbraco.Core.Composing.ComponentCollection.Initialize() in d:\a\1\s\src\Umbraco.Core\Composing\ComponentCollection.cs:line 32
  at Umbraco.Core.Runtime.CoreRuntime.Boot(IRegister register, DisposableTimer timer) in d:\a\1\s\src\Umbraco.Core\Runtime\CoreRuntime.cs:line 188

I've double-checked the connection string to the DB, that's all correct. I've re-added the password and user to the DB, Its literally just stopped working?

Ive removed the API controller from the code in a desperate attempt to get it back, rebuilt but again the same problem.

My last-ditch effort was to upgrade it from 8.6.2 to 8.6.3 and it did start to upgrade, I got the upgrade screen say it had been upgraded from 8.6.2 to 8.6.3 but I get this error again.

Any idea what's going on? How can I bring the site back?