On code "iQueryable.Skip(n).Take(k)" I get error:
"ERROR: 42703: column Extent1.User_Id does not exist"
And other:
"ERROR: 42703: column Extent1.C1 does not exist"
I guess the similar problem is here:
http://pgfoundry.org/forum/forum.php?thread_id=15594&forum_id=519&group_id=1000140

Any fix?

More information:
//query of iQueryable
SELECT "Extent1"."Id" AS "Id","Extent1"."ContractInitiatedDate" AS "ContractInitiatedDate","Extent1"."ContractSentDate" AS "ContractSentDate","Extent1"."ContractSignedDate" AS "ContractSignedDate","Extent1"."UserId" AS "UserId","Extent1"."ResponsibleUserId" AS "ResponsibleUserId","Extent2"."Id" AS "Id1","Extent2"."Email" AS "Email","Extent2"."Phone" AS "Phone","Extent2"."Password" AS "Password","Extent2"."Firstname" AS "Firstname","Extent2"."Lastname" AS "Lastname","Extent2"."Position" AS "Position","Extent2"."Rights" AS "Rights","Extent2"."Ip" AS "Ip","Extent2"."LastActive" AS "LastActive","Extent2"."ProjectDatabaseId" AS "ProjectDatabaseId","Extent2"."CountryId" AS "CountryId","Extent2"."CarrierId" AS "CarrierId","Extent3"."Id" AS "Id2","Extent3"."Email" AS "Email1","Extent3"."Phone" AS "Phone1","Extent3"."Password" AS "Password1","Extent3"."Firstname" AS "Firstname1","Extent3"."Lastname" AS "Lastname1","Extent3"."Position" AS "Position1","Extent3"."Rights" AS "Rights1","Extent3"."Ip" AS "Ip1","Extent3"."LastActive" AS "LastActive1","Extent3"."ProjectDatabaseId" AS "ProjectDatabaseId1","Extent3"."CountryId" AS "CountryId1","Extent3"."CarrierId" AS "CarrierId1","Extent5"."Id" AS "Id3","Extent5"."Name" AS "Name","Extent5"."PhoneCode" AS "PhoneCode","Extent4"."Id" AS "Id4","Extent4"."Name" AS "Name1","Extent1"."User_Id" AS "User_Id","Extent1"."User_Id1" AS "User_Id1" FROM "public"."Prospect" AS "Extent1" INNER JOIN "public"."User" AS "Extent2" ON "Extent1"."ResponsibleUserId"="Extent2"."Id" INNER JOIN "public"."User" AS "Extent3" ON "Extent1"."UserId"="Extent3"."Id" INNER JOIN "public"."Carrier" AS "Extent4" ON "Extent3"."CarrierId"="Extent4"."Id" INNER JOIN "public"."Country" AS "Extent5" ON "Extent3"."CountryId"="Extent5"."Id" ORDER BY "Extent2"."Firstname" ASC ,"Extent2"."Lastname" ASC ,"Extent4"."Name" ASC
//error
[NpgsqlException (0x80004005): ERROR: 42703: column Extent1.User_Id does not exist] Npgsql.<ProcessBackendResponses_Ver_3>d__9.MoveNext() +4069 Npgsql.ForwardsOnlyDataReader.GetNextResponseObject(Boolean cleanup) +1215 Npgsql.ForwardsOnlyDataReader.GetNextRowDescription() +128 Npgsql.ForwardsOnlyDataReader.NextResultInternal() +89 Npgsql.ForwardsOnlyDataReader..ctor(IEnumerable1 dataEnumeration, CommandBehavior behavior, NpgsqlCommand command, NotificationThreadBlock threadBlock, Boolean preparedStatement, NpgsqlRowDescription rowDescription) +216 Npgsql.NpgsqlCommand.GetReader(CommandBehavior cb) +737 Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior cb) +262 Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41 System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10 System.Data.Entity.Infrastructure.Interception.<>c__DisplayClassb.<Reader>b__8() +69 System.Data.Entity.Infrastructure.Interception.InternalDispatcher1.Dispatch(Func1 operation, TInterceptionContext interceptionContext, Action1 executing, Action1 executed) +93 System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) +319 System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) +240 System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10 System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +97

//another query of iQueryable
SELECT "Project1"."Id" AS "Id","Project1"."Name" AS "Name","Project1"."C2" AS "C1","Project1"."Id1" AS "Id1","Project1"."Email" AS "Email","Project1"."Phone" AS "Phone","Project1"."Password" AS "Password","Project1"."Firstname" AS "Firstname","Project1"."Lastname" AS "Lastname","Project1"."Position" AS "Position","Project1"."Rights" AS "Rights","Project1"."Ip" AS "Ip","Project1"."LastActive" AS "LastActive","Project1"."ProjectDatabaseId" AS "ProjectDatabaseId","Project1"."CountryId" AS "CountryId","Project1"."CarrierId" AS "CarrierId","Project1"."Id2" AS "Id2","Project1"."Name1" AS "Name1" FROM (SELECT cast(FALSE as boolean) AS "C1","Extent1"."Id" AS "Id","Extent1"."Name" AS "Name","Extent2"."Id" AS "Id1","Extent2"."Email" AS "Email","Extent2"."Phone" AS "Phone","Extent2"."Password" AS "Password","Extent2"."Firstname" AS "Firstname","Extent2"."Lastname" AS "Lastname","Extent2"."Position" AS "Position","Extent2"."Rights" AS "Rights","Extent2"."Ip" AS "Ip","Extent2"."LastActive" AS "LastActive","Extent2"."ProjectDatabaseId" AS "ProjectDatabaseId","Extent2"."CountryId" AS "CountryId","Extent2"."CarrierId" AS "CarrierId","Extent3"."Id" AS "Id2","Extent3"."Name" AS "Name1", CASE WHEN ("Extent2"."Id" IS NULL ) THEN (CAST (NULL AS int4)) ELSE (1) END AS "C2" FROM "public"."ProjectDatabase" AS "Extent1" LEFT OUTER JOIN "public"."User" AS "Extent2" INNER JOIN "public"."Carrier" AS "Extent3" ON "Extent2"."CarrierId"="Extent3"."Id" ON "Extent1"."Id"="Extent2"."ProjectDatabaseId") AS "Project1" ORDER BY "Project1"."C1" ASC ,"Project1"."Id" ASC ,"Project1"."C2" ASC
//error
[NpgsqlException (0x80004005): ERROR: 42703: column Extent1.C1 does not exist] Npgsql.<ProcessBackendResponses_Ver_3>d__9.MoveNext() +4069 Npgsql.ForwardsOnlyDataReader.GetNextResponseObject(Boolean cleanup) +1215 Npgsql.ForwardsOnlyDataReader.GetNextRowDescription() +128 Npgsql.ForwardsOnlyDataReader.NextResultInternal() +89 Npgsql.ForwardsOnlyDataReader..ctor(IEnumerable1 dataEnumeration, CommandBehavior behavior, NpgsqlCommand command, NotificationThreadBlock threadBlock, Boolean preparedStatement, NpgsqlRowDescription rowDescription) +216 Npgsql.NpgsqlCommand.GetReader(CommandBehavior cb) +737 Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior cb) +262 Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41 System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10 System.Data.Entity.Infrastructure.Interception.<>c__DisplayClassb.<Reader>b__8() +69 System.Data.Entity.Infrastructure.Interception.InternalDispatcher1.Dispatch(Func1 operation, TInterceptionContext interceptionContext, Action1 executing, Action1 executed) +93 System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) +319 System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) +240 System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10 System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +97

On these iQueryable I do "iQueryable.Skip(n).Take(k)" and get errors.

I am using Npgsql 2.1.0-beta1 + Npgsql.EntityFramework