Error accessing the membership profile object

[Argirop]

My app is asp.net 2.0. It works fine on my development machine. When I am
deploying it to the production I get an error.
---------------------
The error is:
Value cannot be null.
Parameter name: type
------------------------
The stack trace is:
[ArgumentNullExc eption: Value cannot be null.
Parameter name: type]
System.Activato r.CreateInstanc e(Type type, Boolean nonPublic) +2797139
System.Web.Prof ile.ProfileBase .CreateMyInstan ce(String username, Boolean
isAuthenticated ) +76
System.Web.Prof ile.ProfileBase .Create(String username, Boolean
isAuthenticated ) +312
System.Web.Http Context.get_Pro file() +89
Epafos.Central. UIL.CentralPage .InitializeCult ure() in
c:\Central\Impl ementation\Solu tion\Central\UI L\App_Code\Cent ralPage.cs:20
ASP.login_aspx. __BuildControlT ree(login_aspx __ctrl) in
c:\WebApps\Cent ral\login.aspx: 1
ASP.login_aspx. FrameworkInitia lize() in
c:\WINNT\Micros oft.NET\Framewo rk\v2.0.50727\T emporary ASP.NET
Files\central\4 8cb4824\7092690 1\App_Web_u0zez mhj.6.cs:0
System.Web.UI.P age.ProcessRequ est(Boolean includeStagesBe foreAsyncPoint,
Boolean includeStagesAf terAsyncPoint) +40
System.Web.UI.P age.ProcessRequ est() +86
System.Web.UI.P age.ProcessRequ estWithNoAssert (HttpContext context) +18
System.Web.UI.P age.ProcessRequ est(HttpContext context) +49
ASP.login_aspx. ProcessRequest( HttpContext context) in
c:\WINNT\Micros oft.NET\Framewo rk\v2.0.50727\T emporary ASP.NET
Files\central\4 8cb4824\7092690 1\App_Web_u0zez mhj.6.cs:0

System.Web.Call HandlerExecutio nStep.System.We b.HttpApplicati on.IExecutionSt ep.Execute() +154
System.Web.Http Application.Exe cuteStep(IExecu tionStep step, Boolean&
completedSynchr onously) +64
----------------------------
Line 20 in
c:\Central\Impl ementation\Solu tion\Central\UI L\App_Code\Cent ralPage.cs file
is:
string languagePrefere nce =
(string)System. Web.HttpContext .Current.Profil e["LanguagePrefer ence"];
-------------------------------
My profile related entries in web.config are:
<connectionStri ngs>
<add name="MembersDB "
connectionStrin g="Database=Cen tral;Server=GIL DA\DEVE2005;Use r
ID=central;Pass word=central;Mi n Pool Size=5;Max Pool Size=50;Packet
Size=3072;Conne ction Lifetime=60;App lication Name=CentralMem berships;"
providerName="S ystem.Data.SqlC lient"/>
</connectionStrin gs>

<profile defaultProvider ="AspNetSqlProf ileProvider">
<providers>
<clear/>
<add name="AspNetSql ProfileProvider "
type="System.We b.Profile.SqlPr ofileProvider" connectionStrin gName="MembersD B"
applicationName ="Central"/>
</providers>
<properties>
<add name="LanguageP reference" type="string" defaultValue="e l-GR"/>
<add name="GridPageS ize" type="int" defaultValue="1 5"/>
</properties>
</profile>

Any help is appreciated.

Thanks