Module Builder is throwing errors after upgrade to 5.1

Hello, I am trying to figure out how to resolve this issue after upgrading to 5.1. in the Administration section, Module Builder marked with Failed status with the following in the error log ..  please help .. 

08/14/2012 04:12:14
Type : System.Configuration.ConfigurationErrorsException, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Message : Invalid configuration section root element "dynamicModulesConfig". Section "Telerik.Sitefinity.DynamicModules.Builder.Configuration.ModuleBuilderConfig" expects element "moduleBuilderConfig".
Source : Telerik.Sitefinity
Help link : 
BareMessage : Invalid configuration section root element "dynamicModulesConfig". Section "Telerik.Sitefinity.DynamicModules.Builder.Configuration.ModuleBuilderConfig" expects element "moduleBuilderConfig".
Filename : 
Line : 0
Errors : System.Configuration.ConfigurationException[]
Data : System.Collections.ListDictionaryInternal
TargetSite : Boolean LoadSectionFromReader(Telerik.Sitefinity.Configuration.ConfigSection, System.Xml.XmlReader, Telerik.Sitefinity.Configuration.ConfigPolicyHandler, System.String, Boolean, UpgradingInfo ByRef)
Stack Trace :    at Telerik.Sitefinity.Configuration.Data.XmlConfigProvider.LoadSectionFromReader(ConfigSection section, XmlReader reader, ConfigPolicyHandler policyHandler, String policyName, Boolean checkForUpgrade, UpgradingInfo& upgradingInfo)
   at Telerik.Sitefinity.Configuration.Data.XmlConfigProvider.LoadSectionFromFile(ConfigSection section, ConfigPolicyHandler policyHandler, String policyName, Boolean withUpgrade)
   at Telerik.Sitefinity.Configuration.Data.XmlConfigProvider.LoadSection(ConfigSection section, ConfigPolicyHandler policyHandler, String policyName)
   at Telerik.Sitefinity.Configuration.ConfigSection.Initialize(ConfigProvider provider, ConfigPolicyHandler policyHandler, String policyName, Boolean singlePolicy)
   at Telerik.Sitefinity.Configuration.ConfigSection.Initialize(ConfigProvider provider)
   at Telerik.Sitefinity.Configuration.Config.GetSectionInternal(Type sectionType, Boolean safeMode)
   at Telerik.Sitefinity.Configuration.Config.GetSectionPrivate(Type sectionType, Boolean safeMode)
   at Telerik.Sitefinity.Configuration.Config.GetSectionPrivate[TSection](Boolean safeMode)
   at Telerik.Sitefinity.DynamicModules.Builder.ModuleBuilderManager.get_ProvidersSettings()
   at Telerik.Sitefinity.Data.ManagerBase`1.GetProvidersSettings()
   at Telerik.Sitefinity.Data.ManagerBase`1.Initialize() 

Hello

We haven't seen this error before. Can you please send us the project before the upgrade. Please inlcude project, configurations and database. I have set up an ftp where you can upload them easily. Just use the following info: 
Set FTP in Active Mode!
IP address: 82.103.64.22
Username: Ibrahim
Password: Zj]1$nwMu]Q
Also you can include the configurations after the upgrade as well.

By providing us with this information we will be able to find the problem faster and provide you with a solution.
Thank you for your cooperation. I look forward to hearing from you.

Thanks Kristian for your response, actually the project size is big, if you can give me some hints about this error I can work it out . 

Hi

For some reason when section ModuleBuilderConfig is loaded the reader for it is not generated properly. 
I have to ask if you have ModuleBuilderConfig.config file in your configurations before the upgrade? If not you can try adding it with artificial custom provider like this: