Hi All,
We recently installed PSO and set up necessary data to run it. We plant to use PSO for manual scheduling.
A dataset is created as shown below.

Dataset is linked to some resources and service delivery units. Capacities were calculated and scheduling activity (marked as manually scheduled) types were created.
After activating dataset, activities can be seen in the workbench but not resources.
No errors are shown in application messages. But we cannot see resources in the workbench.

This exception can be seen also.

Can you guide me to solve this?
TIA.