Recently while trying to open my QA server SharePoint designer workflow I got this error. The full error message is "Unable to load workflow actions from the server. Please contact your server administrator error in SharePoint 2010." But in Dev server I am able to open the workflow and I only did a back and restore from my dev server to QA server. But faced the issue.
Also you can check out my previous posts on:
There may be some solution which are deployed and activated in the Farm level as well as the site collection level.
We need to remove the duplicate solution that is activated in the Site collection level solution gallery.
Follow below steps:
Open Farm Level Solutions (Central Administration):
Browse to SharePoint 2010 Central administration ->Click System Settings ->Click Manage Farm Solutions. (Open in one browser window)
Site Collection Level Solutions:
Open your SharePoint Site collection -> Click Site Actions -> Site Settings -> Solutions (under Gallery Section). (Open in another browser window)
Now check in both the solutions, if there are any solutions which are activated in both the scopes (Farm as well as Site collection). If you found anything then DeActivate the solution from the Site Collection level.