Problem with running migrations on startup

[SanderBreivik]

I have tried implementing migrations on startup. However, I get this error:
System.InvalidCastException: 'Unable to cast object of type 'MongoDB.Bson.BsonDocument' to type 'MongoDB.Bson.BsonString'.'
Stack trace:

  at MongoDB.Bson.BsonValue.get_AsString()
  at Mongo.Migration.Services.DocumentVersionService.GetVersionOrDefault(BsonDocument document)
  at Mongo.Migration.Migrations.Document.DocumentMigrationRunner.Run(Type type, BsonDocument document, DocumentVersion to)
  at Mongo.Migration.Migrations.Document.StartUpDocumentMigrationRunner.RunAll()
  at Mongo.Migration.Services.MigrationService.OnStartup()
  at Mongo.Migration.Services.MigrationService.Migrate()
  at Mongo.Migration.MongoMigration.Run()
  at Mongo.Migration.Startup.Static.MongoMigrationClient.Initialize(IComponentRegistry componentRegistry)
  at Mongo.Migration.Startup.Static.MongoMigrationClient.Initialize(IMongoClient client, IMongoMigrationSettings settings, IContainerAdapter containerAdapter)
  at Dialogue.Composer.Program.<>c__DisplayClass2_0.<CreateHost>b__0(HostBuilderContext context, IServiceCollection services) in C:\Dev\Microservices\Composer\Dialogue.Composer\Program.cs:line 118

What am I doing wrong here?

This is my init:

IMongoClient clientMongoDB = new MongoClient(databaseSettings.ConnectionString);

MongoMigrationClient.Initialize(clientMongoDB, new MongoMigrationSettings
{
    ConnectionString = databaseSettings.ConnectionString,
    Database = databaseSettings.DatabaseName
});

[R3DST0RM]

Were you able to solve the issue?

[NickVandenberghe]

I went through my whole mongo db and searched all documents that included the IDocument interface in c#.
The i went through my mongodb and went through every collection that was relevant untill i found a collection that had the versionProperty that was lik to "Version: {}"

So i suggest doing the same if you encounter this issue.

This error occured for my because i tried to create a custom version property that had the same name for a limited amount of time that corrupted the Version property