Quick (annoying) thing. Whilst deploying a solution, you may see this error:
Error occurred in deployment step ‘Activate Features’: Key cannot be null. Parameter name: Key
This is unhelpfully connected to your Content Type definitions where you have FieldRefs and you’re closing them with the long tag, as opposed to the short tag, i.e.,
<FieldRef ID=”…”></FieldRef>
replace it with this to fix:
<FieldRef ID=”…” />
Thanks to Dhiraj.
Yet another SharePoint vagary. If you’re trying to deploy a feature and get the unhelpful error: “Error occurred in deployment step ‘Activate Features’: Object not set to an instance of an object” check the scope of the feature that you’re trying to deploy. I added a new feature to a project that had another working feature. Both were calling the Microsoft.Office.Workflow.Feature assembly but only one was failing and it was only after a lot of messing about that it turned out to be this innocuous little setting.
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for Matt Thornton