Problem with OpenBSD as nfs client

Hi,

First, im new with OpenBSD 6.3 that i run in Virtualbox.

I try to setup a NFS share :
server is Fedora workstation 28
- exports file looks like this
/home/filip/Documents 192.168.1.1238 (rw)
/home/filip/Public 192.168.1.128 (rw)
Of course NFS is active on the server

client is Openbsd 6.3 and i have this message when i try to mount a share :

filip@openbsd:~$ sudo mount -t nfs 192.168.1.85:/home/filip/Documents /mnt/nfs_Documents/
NFS Portmap: RPC: Program not registered

I will be happy to find a solution after long time on google without succes.
Thanks for help
Philippe.