Exec format error: Unable to run appimage files on ubutu 16.04 and lubuntu 18

I've been trying to run Qv2ray and other programs on Ubuntu 16.04 and Lubuntu 18, but I always get this error: cannot execute binary file: Exec format error. Here's the article that I've read in order to run appimage files: I tried these steps: 1. Installing fuse: sudo apt install libfuse2 2. Making the file executable in properties(Checked). 3. Double clicking on the file. Another file with a weird name appeared next to it, but the program was not executed, and also when I try to run it I get this error: cannot execute binary file: Exec format error.