I'm developing a custom plugin for CRM. When I deploy plugin to CRM on Virtual PC, I get the error below.
Error registering plugins and/or workflows. Legacy plugin steps are only supported in Pre-validation and Post-operation stages
How can I resolve this error ?
Like @Alex has said, it looks like you are using the CRM 4 sdk to develop your plugins. I would recommend using the CRM 2011 SDK in order to not have to rewrite your plugins once you upgrade to 2013 or above. Here's the link:
https://www.microsoft.com/en-us/download/details.aspx?id=24004