local backup - two issues

[blsd34]

Hello,

i'm new here, this community is of great help to experts and non-experts
Hope will be so also for me :-)

I'm becoming crazy with two issues line. Yep, i used search tool and, after i read a lot of discussions, i found a similar problem. Fine, my two issues came three issues :(

My original issues were:

/usr/local/vesta/func/domain.sh: line 238: 3
35: syntax error in expression (error token is "35")

After i saw a help post here about "do wget https://raw.githubusercontent.com/sergh ... ackup-user -O /usr/local/vesta/bin/v-backup-user"
Now i get also this:
/usr/local/vesta/bin/v-backup-user: line 141: format_domain_idn: command not found

Thanks too much

PS. I forgot :) vesta version 0.9.8, centos 6.9, php 7.0 ... other informations ask me. thanks again