Error while run mp.verify()

Hello,

In our environment we are working with operation manager 2012.

I use this guide to create override manually, using c#:

http://msdn.microsoft.com/en-us/library/bb960482.aspx

This work for a while but now I am getting a weird error:

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Error 1:
Found error in 2|DorliTest|1.0.0.0|DorliTest|| with message:
Detected malicious verification code when verifying element of type Microsoft.EnterpriseManagement.Configuration.ManagementPackLanguagePack with inner exception: Microsoft.EnterpriseManagement.Common.ObjectNotFoundException: An object of class ManagementPackElement with ID be299755-887f-1f9f-5e7e-36794e4e93ef was not found.
   at Microsoft.EnterpriseManagement.Configuration.ManagementPackElementReference`1.FetchElement(IManagementPackSearch searcher)
   at Microsoft.EnterpriseManagement.Configuration.ManagementPackElementReference`1.GetElement()
   at Microsoft.EnterpriseManagement.Configuration.ManagementPackElementInfo.Verify(VerificationContext context)
   at Microsoft.EnterpriseManagement.Configuration.ManagementPackDisplayString.Verify(VerificationContext context)
   at Microsoft.EnterpriseManagement.Configuration.ManagementPackLanguagePack.Verify(VerificationContext context)
   at Microsoft.EnterpriseManagement.Configuration.Verification.VerificationEngine.VerifyCollectionItems(Object context)
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I am really don't know what's happened since that last time I saw my program work
I can tell that some Monitor Objects still works fine and I am able to add overrides form them.
We have try to look for solution but couldn't find any.
Please help me to solve the problem.
Thanks in advance,
Aviram.