Rosrun executable not found

Hello, I'm trying to run a node from rosrun (it works when I manually enter ./program inside build directory). Yet it doesn't work when called by rosrun - it finds the directory by tab completion, but not the executable. How can I help it? I need it to use it in launch files. [rosrun] Found the following, but they're either not files, [rosrun] or not executable: [rosrun] /home/user/ros_ws/catkin_ws/src/ros_programme