"Permission denied (publickey)" when pulling uploads

Hey, as in title, I'm getting some error caused by rsync. That's the command I type:

./bin/uploads.sh production com.example pull

And that's the error:

TASK [Pull uploads] *************************************************************************************
System info:
  Ansible 2.4.3.0; Linux
  Trellis at "Enable Virtualbox ioapic option"
---------------------------------------------------
fatal: [user@example.com]: FAILED! => {"changed": false, "cmd": "/usr/bin/rsync --delay-updates -F --compress --delete-after --archive --rsh=/usr/bin/ssh -S none -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null --exclude=.DS_Store --stats --out-format=<<CHANGED>>%i %n%L web@user@example.com:/srv/www/com.example/current/web/app/uploads/ /home/kacper/com.example-trellis/site/com.example/web/app/uploads/", "msg": "Warning: Permanently added 'example.com,11.111.111.11' (ED25519) to the list of known hosts.\r\nPermission denied (publickey).\r\nrsync: connection unexpectedly closed (0 bytes received so far) [Receiver]\nrsync error: unexplained error (code 255) at io.c(226) [Receiver=3.1.1]\n", "rc": 255}

I've replaced my company's internal info with example ;) What's interesting, I'm able to login into my local development virtual machine by vagrant ssh, and then proceed to login into my remote production machine. I'm quite newbie into Trellis as well as Ansible, so please be understanding ;)

valentinocossar / trellis-database-uploads-migration

"Permission denied (publickey)" when pulling uploads #11