THe assembly where MyNamespace is located in, is that indeed named MyNamespace.EntityLayer.dll ? Is this in a webapp or winforms app? I also find this odd:
<section ... SD.LLBLGen.Pro.ORMSupportClasses.DependencyInjectionSectionHandler, SD.LLBLGen.Pro.ORMSupportClasses.NET20, Version=2.5.7.831,Culture=neutral, PublicKeyToken=ca73b74ba4e3ff27...
This doesn't work, you specified the FILEversion, but assembly signatures use the ASSEMBLYversion, which is 2.5.0.0
So it should be:
<section name="dependencyInjectionInformation" type="SD.LLBLGen.Pro.ORMSupportClasses.DependencyInjectionSectionHandler, SD.LLBLGen.Pro.ORMSupportClasses.NET20, Version=2.5.0.0,Culture=neutral, PublicKeyToken=ca73b74ba4e3ff27"/>
(please also use a later runtime build than august 31st )