Hi Yacine,
Yes until and unless vmcj/enable = on VMC will not get active.
Please make the missing entries in RZ10 and restart the server;
vmcj/option/maxJavaHeap = 200M
vmcj/option/ps = 512M
vmcj/enable = on
If problem persist then ask basis consultant (basically basis consultant needs to set the entries in RZ10) to implement SAP Note 854170 - Switching on the component "VM Container"
Let me know for any issue.
Regards,
Kamfrk.