Tuesday, 13 April 2010

Message: Type 'umbraco.DataLayer.SqlHelperException' in Assembly 'umbraco.DataLayer, Version=0.3.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

This is most likely because the database is inaccessible to Umbraco.  Check the connection strings are correct and also try connecting using the same connection string credentials with SQL Management Studio.