Quick post here. Hopefully you find this before spending an hour on it like I did. It ended up being a typo in a write action type id.

Basically, it simply came down to changing this:

<WriteAction ID=”WA” TypeID=”MyMp.MyWriteActin”>

To this:

<WriteAction ID=”WA” TypeID=”MyMp.MyWriteAction”>

Lesson learned – be careful when authoring XML directly and use intellisense when it’s available.

Below is the full error I receive by the Visual Studio Authoring Extensions.

Error    72    Detected malicious verification code when verifying element of type Microsoft.EnterpriseManagement.Configuration.ManagementPackRule with inner exception: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at Microsoft.EnterpriseManagement.Configuration.ManagementPackRule.VerifyDataTypes(Dictionary`2 moduletypes)
at Microsoft.EnterpriseManagement.Configuration.ManagementPackRule.Verify(VerificationContext context)
at Microsoft.EnterpriseManagement.Configuration.Verification.VerificationEngine.VerifyCollectionItems(Object context)   (Path = DR.DiscoveryAutomation)    Management Pack Display Name.mpx    11    10    Discovery Automation