This Website does not support workflows created by SharePoint Designer.

Issue: This Website does not support workflows created by SharePoint Designer.

One of my clients today came up with unique issue that he is not able to create any workflow in the designer. 

Troubleshooting: 

1.      Based on the error message, I have checked the permissions of the clients; he has Full control permissions on the site.  

2.      The website was allowed to use the Designer (It is restricted in our environment).

3.      Check the permissions on the library where he was trying to create workflow. Correct permissions were in place for the workflow history library as well.

4.      Both of these libraries inheriting permissions from the site. No question of permissions issue on the site level.

5.      Tried to disable contributor access in the designer.

6.      Tried to change the proxy via designer. 

7.      Workaround to the problem was adding him as a site collection admin. However, this was not a permanent solution to the problem.

Little hard goggling help to resolve the issue. 

Resolution:

Exit and then start Office SharePoint Designer 2007.

The site owner should verify that the affected user has been added to the list of users who have permissions to the Workflows library. If not, add the user to the list: 

1.      In Office SharePoint Designer 2007, in the Folder List, right-click the Workflows library, and then click Properties.

2.      Click the Security tab.

3.      Click Manage permissions using the browser.

4.      In the browser, on the Permissions: Workflows page, click New, and then click Add Users.

5.      Add the user to the list.

If you have any queries/questions regarding the above mentioned information then please let me know. 

I would be more than happy to help you as well as resolves your issues, Thank you.