Capistrano deployment failing with 'rbenv: /home/alexander/.rvm/bin/rvm: command not found'

I won't show the whole log but here's the error message:

```
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as alexander@104.236.110.192: bundle exit status: 127
bundle stdout: rbenv: /home/alexander/.rvm/bin/rvm: command not found
bundle stderr: Nothing written

SSHKit::Command::Failed: bundle exit status: 127
bundle stdout: rbenv: /home/alexander/.rvm/bin/rvm: command not found
bundle stderr: Nothing written

Tasks: TOP => deploy:updated => bundler:install
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as alexander@104.236.110.192: bundle exit status: 127
bundle stdout: rbenv: /home/alexander/.rvm/bin/rvm: command not found
bundle stderr: Nothing written
```

I have no idea what this means. Ideas?