VPN not working after root and installing Rom .. ( block platform system )

Hello guys .. i faced problem when i rooted my s6 G920F .. and i installed Rom http://ift.tt/1Eornv9 .. i can not open VPN ..

i try to use "busybox" and "OpenVpn"
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i wish to find answer for this problem

from xda-developers http://ift.tt/2acyoXA
via IFTTT