permission denied when loading workspace environment on remote machine

edit

I want to run a node on another computer through roslaunch. What I'm doing is:

<machine name="jetson" address="192.168.2.2" env-loader="~/el2425_ws/devel/env.sh" user="..." password="..."/>
<node machine="jetson" pkg="sensor_helpers" type="process_imu.py" name="imu_processing"/>

But I get the error:

remote[192.168.2.2-0] starting roslaunch
remote[192.168.2.2-0]: creating ssh connection to 192.168.2.2:22, user[ubuntu]
/usr/lib/python2.7/dist-packages/Crypto/Cipher/blockalgo.py:141: FutureWarning: CTR mode needs counter parameter, not IV
  self._cipher = factory.new(key, *args, **kwargs)
launching remote roslaunch child with command: [env ROS_MASTER_URI=http://192.168.2.2:11311 ~/el2425_ws/devel/ 
env.sh roslaunch -c 192.168.2.2-0 -u http://192.168.2.210:36330/ --run_id 071ad98c-1dd4-11b2-b08c-00044b49198a]
remote[192.168.2.2-0]: ssh connection created
remote[192.168.2.2-0]: env: /home/ubuntu/el2425_ws/devel/: Permission denied

How can I give roslaunch permission to to load the environment for the workspace nodes?