Hi Pablo,
For this report there are some pre-requisites, in previous screenshot you had shown us that the Load Data Warehouse both Full load and incremental are running in the system.
Additionally could you check on the below details:
Could you check the following table -> dwh_inv_task_hierarchy , if it is being populated post run of the load Data Warehouse jobs ? The phase / task grouping present in the report is dependent on this table
Is the time slices in the system regularly getting updated, specifically check for -> MONTHLYRESOURCEBASECURVE , MONTHLYRESOURCEACTCURVE, MONTHLYRESOURCEESTCURVE
Also surely the project is having resource / roles assigned to tasks present in the project
Regards,
Samik