Cannot install ADCS Web Enrollment

Hello

When I try to install ADCS Web Enrollment on my CA (which is also a DC/DNS/DFS) I've got this error :

C:\Windows\system32>ServerManagerCmd.exe -install ADCS-Web-Enrollment
...
114.695.0: 0x80070057 (WIN32: 87)
205.158.0: 0x80004003 (-2147467261)
Error: Cannot install Certification Authority Web Enrollment.

Error: Install was cancelled.


If I try with servermanager, the error is : certification authority web enrollment cannot be installed on this computer

Have got some hints ?