Custom Member provider and connectionstring can't be blank

Hi
I published my asp.net application to IIS 7. My custom role provider works perfectly but when I click on my users admin button I get message that the connectionstring can't be blank. This works perfectly in Visual Studio 2012.
 
My inintialize in my membership provider:
' ' Initialize OdbcConnection. ' Dim rootWebConfig As System.Configuration.Configuration rootWebConfig = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("/HCCWebBusinessPlanningSolution") Dim ConnectionStringSettings As System.Configuration.ConnectionStringSettings If (rootWebConfig.ConnectionStrings.ConnectionStrings.Count > 0) Then ConnectionStringSettings = rootWebConfig.ConnectionStrings.ConnectionStrings("DefaultConnection") 'Dim ConnectionStringSettings As ConnectionStringSettings ...