According to the screenshot, I think you cannot access the SQL Analysis Services Server (SSAS).
You can open Event viewer on your SQL Server and see the following error in the Application folder ：
Please the following steps:
1)Go to SharePoint Central Administration >> click "Manage service applications"
2)On Manage service applications page, select "Project Server Service Application">>select the Project Web App Instance, then click "Manage" option
3)Click “OLAP Database Management” >> select the OLAP Database Instance and click "Build Now" button
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.