Gitlab runner execution error with ssh connection

I try to run a gitlab runner which connects via ssh to a server and makes a git pull. I have the following minimal test.

in .gitlab-ci.yml I have the following code in the script segment.

  - apt-get update
  - apt-get install sshpass -y
  - sshpass -p "password" ssh pdfssh@ -p 7522 "cd /var/www/html/pdfgen && touch test.txt"

At the end I got this error: ERROR: Job failed: exit code 1 nothing more. What is my issue in this case?

Thanks in advance.