Possible null reference argument for parameter 'parentId' in 'Activity Activity.SetParentId(string parentId)'.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

Non-nullable property 'Bron' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable field '_allowedTypes' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference argument for parameter 'postgreSqlOptions' in 'void ConfigurationExtensions.ThrowIfInvalid(PostgreSqlOptionsSection postgreSqlOptions)'.

Possible null reference argument for parameter 'elasticSearchOptions' in 'void ConfigurationExtensions.ThrowIfInvalid(ElasticSearchOptionsSection elasticSearchOptions)'.

Dereference of a possibly null reference.

Possible null reference return.

Non-nullable property 'Bron' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

Non-nullable field '_allowedTypes' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference argument for parameter 'parentId' in 'Activity Activity.SetParentId(string parentId)'.

Possible null reference argument for parameter 'postgreSqlOptions' in 'void ConfigurationExtensions.ThrowIfInvalid(PostgreSqlOptionsSection postgreSqlOptions)'.

Possible null reference argument for parameter 'elasticSearchOptions' in 'void ConfigurationExtensions.ThrowIfInvalid(ElasticSearchOptionsSection elasticSearchOptions)'.

Dereference of a possibly null reference.