Could not find a part of the path of ReportManager's Web.config

Could not find a part of the path 'C:\Program Files\Microsoft SQL Server\MSRS13.[SSRSInstanceName]\Reporting Services\ReportManager\Web.config

Environment

- Windows Server 2012 R2 Standard Edition 64 bit

- SQL Server 2016 Reporting Services Standard Edition 64 bit

- Dynamics AX 2012 R3 CU11

I've configured on the Reporting Services Configuration Manager, Web service and Report Manager can access.

Then install Dynamics AX 2012 R3 CU11 Reporting Services extensions and it's failed with error 

"Could not find a part of the path 'C:\Program Files\Microsoft SQL Server\MSRS13.[SSRSInstanceName]\Reporting Services\ReportManager\Web.config"

Locate to the SSRS instance root directory and not found the "ReportManager" folder.

Regards.