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Platform Ubuntu 11.10 beta.
MonoDevelop Build date: 2011-09-22 12:46:54+0000
Here's how I got to this bug. I created an ASP.NET MVC Project, Added a PostgreSQL database connection then Tools, Database, Generate Linq Class (or Solution, Project, Right-mouse-click, Tools, Generate Linq Class.)
Following these insctrutions http://monodevelop.com/Documentation/Linq I picked my database connection (which was working OK to read the DB) accepted all defaults and received:
Cannot create Linq Class.
MonoDevelop.Database.Sql.SqlMetalExecException: sqlmetal: Object reference not set to an instance of an object
That's not supported anymore.