Exception: System.ArgumentNullException: Value cannot be null.
Steps to reproduce:
When trying to validate connection, convert an email into a task an error occurs:
Error
Exception: System.ArgumentNullException: Value cannot be null.
Reason
The Add-In is not yet compatible with the New User Experience mode of Easy Projects.
Solution
Go to your Easy Projects account settings and switch to the Classic User Experience mode.
When open Settings tab of the Add-In in Outlook and push “Validate connection” button.