I have been making an application with the APEX tool for several weeks. Now I need to use the Restfull services to integrate my system with others however the Restfull Workshop section is not available and I cannot access that section.
The error is the following:
The ORDS section of the REST Workshop is not available. This is likely due to an insufficient version of ORDS. Access denied by Page security check

I've been trying to solve this problem for days without success. I have reinstalled APEX to the new version, I have reinstalled ORDS, I have searched on the internet, in forums but I have not found any information either.
Could someone help me with this matter? I'm a bit desperate.
Thank you very much.